Sound waves cannot propagate in a vacuum. This is because sound waves are mechanical waves that require a medium, such as air, water, or solid material, to travel through. Sound waves are longitudinal waves, where the oscillation of the particles in the medium is parallel to the direction of wave prRead more
Sound waves cannot propagate in a vacuum. This is because sound waves are mechanical waves that require a medium, such as air, water, or solid material, to travel through.
Sound waves are longitudinal waves, where the oscillation of the particles in the medium is parallel to the direction of wave propagation. Unlike sound waves, light waves are electromagnetic waves that can travel through the vacuum of space without requiring a medium.
The reason sound waves cannot be transmitted through a vacuum is that there are no particles or molecules present in a vacuum to transmit the vibrations that create sound waves. In contrast, electromagnetic waves like light can propagate through the empty space of a vacuum, as they do not rely on the presence of a medium to travel.
Therefore, the correct answer is option (C) Sound, as sound waves are the only type of wave mentioned that cannot propagate in a vacuum.
The photoelectric effect was proposed by Einstein (Option [C]). In 1905, Albert Einstein provided a groundbreaking explanation for the photoelectric effect, where electrons are ejected from a material's surface when illuminated by light. He proposed that light consists of discrete packets of energyRead more
The photoelectric effect was proposed by Einstein (Option [C]). In 1905, Albert Einstein provided a groundbreaking explanation for the photoelectric effect, where electrons are ejected from a material’s surface when illuminated by light. He proposed that light consists of discrete packets of energy called photons, and each photon transfers its energy to an electron, enabling it to escape from the material. This theory introduced the concept of the photon as a quantum of light and challenged the classical wave theory of light.
Options [A] Compton, [B] Maxwell, and [D] Newton made significant contributions to physics, but they are not credited with explaining the photoelectric effect. Compton is known for the Compton effect involving X-rays, Maxwell formulated Maxwell’s equations describing electromagnetism, and Newton proposed the corpuscular theory of light.
Einstein’s explanation of the photoelectric effect laid the foundation for quantum mechanics and led to further advancements in understanding the dual wave-particle nature of light, influencing modern physics profoundly.
The first person to demonstrate that diffraction of light waves occurs was Young (Option [B]). Thomas Young, an English scientist, conducted the famous double-slit experiment in the early 19th century. In this experiment, he observed interference patterns produced by light passing through two closelRead more
The first person to demonstrate that diffraction of light waves occurs was Young (Option [B]). Thomas Young, an English scientist, conducted the famous double-slit experiment in the early 19th century. In this experiment, he observed interference patterns produced by light passing through two closely spaced slits, providing direct evidence of light behaving as a wave. Diffraction patterns formed when light waves passed through small openings or around edges, demonstrating wave-like characteristics such as interference and diffraction.
Option [A], Gramaldi, is not associated with contributions to optics or light phenomena. Option [C], Maxwell, formulated Maxwell’s equations describing electromagnetism. Option [D], Foucault, made significant contributions to optics and physics, but he is known for his work on the speed of light and pendulum experiments.
Therefore, Thomas Young’s double-slit experiment established the phenomenon of light diffraction, crucial in demonstrating that light exhibits wave properties, laying the groundwork for the wave theory of light and advancing our understanding of optics and wave behavior.
The electromagnetic nature of light was discovered by Maxwell (Option [C]). James Clerk Maxwell, a Scottish physicist, formulated Maxwell's equations in the mid-19th century. These equations unified electricity and magnetism, predicting the existence of electromagnetic waves, including light. MaxwelRead more
The electromagnetic nature of light was discovered by Maxwell (Option [C]). James Clerk Maxwell, a Scottish physicist, formulated Maxwell’s equations in the mid-19th century. These equations unified electricity and magnetism, predicting the existence of electromagnetic waves, including light. Maxwell demonstrated that light is an electromagnetic wave propagating through space at the speed of light, and his work laid the foundation for understanding the fundamental relationship between electricity, magnetism, and light.
Option [A], Snell, is known for Snell’s law of refraction, describing how light bends when passing through different materials. Option [B], Newton, proposed the corpuscular theory of light, suggesting light as a stream of particles. Option [D], Young, conducted experiments demonstrating the wave nature of light through his double-slit experiment, contributing to the understanding of light as waves.
Thus, James Clerk Maxwell is credited with discovering the electromagnetic nature of light, revolutionizing physics with his unified theory of electromagnetism.
The transverse nature of light waves is confirmed based on the phenomenon of polarization (Option [C]). Polarization refers to the orientation of the electric field component of light waves as they propagate. When unpolarized light passes through a polarizing filter, only the component of the electrRead more
The transverse nature of light waves is confirmed based on the phenomenon of polarization (Option [C]). Polarization refers to the orientation of the electric field component of light waves as they propagate. When unpolarized light passes through a polarizing filter, only the component of the electric field aligned with the filter’s polarization axis can pass through, demonstrating that light waves oscillate perpendicular to their direction of propagation.
This behavior aligns with the characteristics of transverse waves, where oscillations occur perpendicular to the wave’s direction of travel. Polarization effects are observed in various optical phenomena, including glare reduction, 3D movie viewing with polarized glasses, and the study of light interaction with materials such as crystals.
While interference (Option [B]), double refraction (Option [A]), and reflection (Option [D]) also demonstrate various properties of light waves, they do not directly confirm the transverse nature of light waves as conclusively as polarization does. Therefore, polarization stands out as the phenomenon that unequivocally supports the transverse wave nature of light.
The wave theory of light was proposed by Huygens (Option [B]). Christiaan Huygens, a Dutch scientist, introduced this theory in the late 17th century. He postulated that light propagates as a wave through a medium known as the luminiferous aether. Huygens' wave theory provided explanations for phenoRead more
The wave theory of light was proposed by Huygens (Option [B]). Christiaan Huygens, a Dutch scientist, introduced this theory in the late 17th century. He postulated that light propagates as a wave through a medium known as the luminiferous aether. Huygens’ wave theory provided explanations for phenomena such as reflection, refraction, and diffraction, which could be understood based on the principles of wave interference and superposition.
Sir Isaac Newton (Option [A]), on the other hand, initially proposed a corpuscular theory of light, where he described light as a stream of particles. This theory had difficulty explaining certain optical behaviors but gained traction due to Newton’s reputation.
Options [C] Planck and [D] Faraday were influential in other areas of physics, particularly in quantum theory and electromagnetism, respectively, but they did not propose the wave theory of light.
Thus, Huygens is credited with pioneering the wave theory of light, which laid the foundation for modern understanding of light as an electromagnetic wave.
Light waves are classified as transverse waves (Option [A]). Transverse waves are characterized by oscillations perpendicular to the direction of energy transfer. In the case of light, electric and magnetic fields oscillate perpendicular to the direction of propagation. This wave behavior is governeRead more
Light waves are classified as transverse waves (Option [A]). Transverse waves are characterized by oscillations perpendicular to the direction of energy transfer. In the case of light, electric and magnetic fields oscillate perpendicular to the direction of propagation. This wave behavior is governed by Maxwell’s equations in classical electromagnetism.
Light waves do not exhibit longitudinal wave characteristics (Option [B]), where oscillations occur parallel to the direction of energy transfer. Longitudinal waves involve compressions and rarefactions, typical of sound waves traveling through air or other mediums.
Therefore, light waves are fundamentally transverse electromagnetic waves. They propagate through vacuum at the speed of light (approximately 3 × 10^8 meters per second) and can travel through transparent materials such as glass or water. The transverse nature of light waves allows for phenomena like polarization, interference, diffraction, and refraction, which are essential in optics and the study of light behavior. Thus, Option [A], transverse wave, accurately describes the wave nature of light.
Light is made up of small particles called "photons" (Option [D]). Photons are fundamental particles of light and electromagnetic radiation. They have zero rest mass, move at the speed of light, and carry energy proportional to their frequency. Photons exhibit properties of both particles and waves,Read more
Light is made up of small particles called “photons” (Option [D]). Photons are fundamental particles of light and electromagnetic radiation. They have zero rest mass, move at the speed of light, and carry energy proportional to their frequency. Photons exhibit properties of both particles and waves, as described by quantum mechanics. They interact with matter through processes such as absorption, emission, and scattering.
Atoms (Option [A]) are the basic units of matter composed of protons, neutrons, and electrons. Neutrons (Option [B]) are subatomic particles found in atomic nuclei. Positrons (Option [C]) are antimatter particles with the same mass as electrons but a positive charge. These options do not describe the fundamental particles of light. Therefore, photons are uniquely responsible for the transmission and interaction of electromagnetic radiation, making them the essential constituents of light according to modern physics.
The unit of measurement of sound intensity is the Decibel (dB). Decibel is a logarithmic unit used to quantify the intensity or loudness of sound. It represents the ratio of a sound pressure level to a reference level, typically the threshold of human hearing at 1 kHz. The decibel scale is logarithmRead more
The unit of measurement of sound intensity is the Decibel (dB). Decibel is a logarithmic unit used to quantify the intensity or loudness of sound. It represents the ratio of a sound pressure level to a reference level, typically the threshold of human hearing at 1 kHz. The decibel scale is logarithmic because the human perception of sound intensity covers a wide range, from the faintest sound we can hear to the threshold of pain.
The decibel scale allows us to express both very large and very small values of sound intensity conveniently. For example, normal conversation might range around 60-70 dB, while a jet engine at close range could exceed 140 dB. Decibels are used in various fields including acoustics, engineering, environmental noise monitoring, and occupational health and safety.
Options [B] Fathom and [C] Arg are not units of measurement for sound intensity. Therefore, among the options provided, the correct answer for the unit of measurement of sound intensity is the Decibel (dB).
On hearing thunder, a person opens his mouth so that to equalize the air pressure on the eardrum of both the ears (Option [B]). Thunder is often accompanied by a sudden change in atmospheric pressure. By opening the mouth slightly, the person can equalize the pressure inside and outside the ear canaRead more
On hearing thunder, a person opens his mouth so that to equalize the air pressure on the eardrum of both the ears (Option [B]). Thunder is often accompanied by a sudden change in atmospheric pressure. By opening the mouth slightly, the person can equalize the pressure inside and outside the ear canal, reducing discomfort or pain caused by the pressure difference. This action helps prevent the eardrums from being pushed inward or outward abruptly, which can occur during rapid changes in air pressure.
Options [A] and [C] are less likely reasons because fear does not directly relate to opening the mouth, and opening the mouth does not significantly affect sound reception compared to the function of equalizing pressure. Option [D] is incorrect as opening the mouth is not primarily intended to expel air. Therefore, among the options provided, equalizing the air pressure on both eardrums is the most plausible reason for opening the mouth upon hearing thunder.
Which waves cannot propagate in vacuum?
Sound waves cannot propagate in a vacuum. This is because sound waves are mechanical waves that require a medium, such as air, water, or solid material, to travel through. Sound waves are longitudinal waves, where the oscillation of the particles in the medium is parallel to the direction of wave prRead more
Sound waves cannot propagate in a vacuum. This is because sound waves are mechanical waves that require a medium, such as air, water, or solid material, to travel through.
See lessSound waves are longitudinal waves, where the oscillation of the particles in the medium is parallel to the direction of wave propagation. Unlike sound waves, light waves are electromagnetic waves that can travel through the vacuum of space without requiring a medium.
The reason sound waves cannot be transmitted through a vacuum is that there are no particles or molecules present in a vacuum to transmit the vibrations that create sound waves. In contrast, electromagnetic waves like light can propagate through the empty space of a vacuum, as they do not rely on the presence of a medium to travel.
Therefore, the correct answer is option (C) Sound, as sound waves are the only type of wave mentioned that cannot propagate in a vacuum.
Photoelectric effect was proposed by
The photoelectric effect was proposed by Einstein (Option [C]). In 1905, Albert Einstein provided a groundbreaking explanation for the photoelectric effect, where electrons are ejected from a material's surface when illuminated by light. He proposed that light consists of discrete packets of energyRead more
The photoelectric effect was proposed by Einstein (Option [C]). In 1905, Albert Einstein provided a groundbreaking explanation for the photoelectric effect, where electrons are ejected from a material’s surface when illuminated by light. He proposed that light consists of discrete packets of energy called photons, and each photon transfers its energy to an electron, enabling it to escape from the material. This theory introduced the concept of the photon as a quantum of light and challenged the classical wave theory of light.
Options [A] Compton, [B] Maxwell, and [D] Newton made significant contributions to physics, but they are not credited with explaining the photoelectric effect. Compton is known for the Compton effect involving X-rays, Maxwell formulated Maxwell’s equations describing electromagnetism, and Newton proposed the corpuscular theory of light.
Einstein’s explanation of the photoelectric effect laid the foundation for quantum mechanics and led to further advancements in understanding the dual wave-particle nature of light, influencing modern physics profoundly.
See lessWho first showed that diffraction of light waves occurs?
The first person to demonstrate that diffraction of light waves occurs was Young (Option [B]). Thomas Young, an English scientist, conducted the famous double-slit experiment in the early 19th century. In this experiment, he observed interference patterns produced by light passing through two closelRead more
The first person to demonstrate that diffraction of light waves occurs was Young (Option [B]). Thomas Young, an English scientist, conducted the famous double-slit experiment in the early 19th century. In this experiment, he observed interference patterns produced by light passing through two closely spaced slits, providing direct evidence of light behaving as a wave. Diffraction patterns formed when light waves passed through small openings or around edges, demonstrating wave-like characteristics such as interference and diffraction.
Option [A], Gramaldi, is not associated with contributions to optics or light phenomena. Option [C], Maxwell, formulated Maxwell’s equations describing electromagnetism. Option [D], Foucault, made significant contributions to optics and physics, but he is known for his work on the speed of light and pendulum experiments.
Therefore, Thomas Young’s double-slit experiment established the phenomenon of light diffraction, crucial in demonstrating that light exhibits wave properties, laying the groundwork for the wave theory of light and advancing our understanding of optics and wave behavior.
See lessWho discovered the electromagnetic nature of light?
The electromagnetic nature of light was discovered by Maxwell (Option [C]). James Clerk Maxwell, a Scottish physicist, formulated Maxwell's equations in the mid-19th century. These equations unified electricity and magnetism, predicting the existence of electromagnetic waves, including light. MaxwelRead more
The electromagnetic nature of light was discovered by Maxwell (Option [C]). James Clerk Maxwell, a Scottish physicist, formulated Maxwell’s equations in the mid-19th century. These equations unified electricity and magnetism, predicting the existence of electromagnetic waves, including light. Maxwell demonstrated that light is an electromagnetic wave propagating through space at the speed of light, and his work laid the foundation for understanding the fundamental relationship between electricity, magnetism, and light.
Option [A], Snell, is known for Snell’s law of refraction, describing how light bends when passing through different materials. Option [B], Newton, proposed the corpuscular theory of light, suggesting light as a stream of particles. Option [D], Young, conducted experiments demonstrating the wave nature of light through his double-slit experiment, contributing to the understanding of light as waves.
Thus, James Clerk Maxwell is credited with discovering the electromagnetic nature of light, revolutionizing physics with his unified theory of electromagnetism.
See lessOn the basis of which of the following phenomena, the transverse nature of light waves is confirmed?
The transverse nature of light waves is confirmed based on the phenomenon of polarization (Option [C]). Polarization refers to the orientation of the electric field component of light waves as they propagate. When unpolarized light passes through a polarizing filter, only the component of the electrRead more
The transverse nature of light waves is confirmed based on the phenomenon of polarization (Option [C]). Polarization refers to the orientation of the electric field component of light waves as they propagate. When unpolarized light passes through a polarizing filter, only the component of the electric field aligned with the filter’s polarization axis can pass through, demonstrating that light waves oscillate perpendicular to their direction of propagation.
This behavior aligns with the characteristics of transverse waves, where oscillations occur perpendicular to the wave’s direction of travel. Polarization effects are observed in various optical phenomena, including glare reduction, 3D movie viewing with polarized glasses, and the study of light interaction with materials such as crystals.
While interference (Option [B]), double refraction (Option [A]), and reflection (Option [D]) also demonstrate various properties of light waves, they do not directly confirm the transverse nature of light waves as conclusively as polarization does. Therefore, polarization stands out as the phenomenon that unequivocally supports the transverse wave nature of light.
See lessBy whom was the wave theory of light proposed?
The wave theory of light was proposed by Huygens (Option [B]). Christiaan Huygens, a Dutch scientist, introduced this theory in the late 17th century. He postulated that light propagates as a wave through a medium known as the luminiferous aether. Huygens' wave theory provided explanations for phenoRead more
The wave theory of light was proposed by Huygens (Option [B]). Christiaan Huygens, a Dutch scientist, introduced this theory in the late 17th century. He postulated that light propagates as a wave through a medium known as the luminiferous aether. Huygens’ wave theory provided explanations for phenomena such as reflection, refraction, and diffraction, which could be understood based on the principles of wave interference and superposition.
Sir Isaac Newton (Option [A]), on the other hand, initially proposed a corpuscular theory of light, where he described light as a stream of particles. This theory had difficulty explaining certain optical behaviors but gained traction due to Newton’s reputation.
Options [C] Planck and [D] Faraday were influential in other areas of physics, particularly in quantum theory and electromagnetism, respectively, but they did not propose the wave theory of light.
Thus, Huygens is credited with pioneering the wave theory of light, which laid the foundation for modern understanding of light as an electromagnetic wave.
See lessWhat type of wave is light wave?
Light waves are classified as transverse waves (Option [A]). Transverse waves are characterized by oscillations perpendicular to the direction of energy transfer. In the case of light, electric and magnetic fields oscillate perpendicular to the direction of propagation. This wave behavior is governeRead more
Light waves are classified as transverse waves (Option [A]). Transverse waves are characterized by oscillations perpendicular to the direction of energy transfer. In the case of light, electric and magnetic fields oscillate perpendicular to the direction of propagation. This wave behavior is governed by Maxwell’s equations in classical electromagnetism.
Light waves do not exhibit longitudinal wave characteristics (Option [B]), where oscillations occur parallel to the direction of energy transfer. Longitudinal waves involve compressions and rarefactions, typical of sound waves traveling through air or other mediums.
Therefore, light waves are fundamentally transverse electromagnetic waves. They propagate through vacuum at the speed of light (approximately 3 × 10^8 meters per second) and can travel through transparent materials such as glass or water. The transverse nature of light waves allows for phenomena like polarization, interference, diffraction, and refraction, which are essential in optics and the study of light behavior. Thus, Option [A], transverse wave, accurately describes the wave nature of light.
See lessLight is made up of small particles, which are called
Light is made up of small particles called "photons" (Option [D]). Photons are fundamental particles of light and electromagnetic radiation. They have zero rest mass, move at the speed of light, and carry energy proportional to their frequency. Photons exhibit properties of both particles and waves,Read more
Light is made up of small particles called “photons” (Option [D]). Photons are fundamental particles of light and electromagnetic radiation. They have zero rest mass, move at the speed of light, and carry energy proportional to their frequency. Photons exhibit properties of both particles and waves, as described by quantum mechanics. They interact with matter through processes such as absorption, emission, and scattering.
Atoms (Option [A]) are the basic units of matter composed of protons, neutrons, and electrons. Neutrons (Option [B]) are subatomic particles found in atomic nuclei. Positrons (Option [C]) are antimatter particles with the same mass as electrons but a positive charge. These options do not describe the fundamental particles of light. Therefore, photons are uniquely responsible for the transmission and interaction of electromagnetic radiation, making them the essential constituents of light according to modern physics.
See lessThe unit of measurement of sound intensity is
The unit of measurement of sound intensity is the Decibel (dB). Decibel is a logarithmic unit used to quantify the intensity or loudness of sound. It represents the ratio of a sound pressure level to a reference level, typically the threshold of human hearing at 1 kHz. The decibel scale is logarithmRead more
The unit of measurement of sound intensity is the Decibel (dB). Decibel is a logarithmic unit used to quantify the intensity or loudness of sound. It represents the ratio of a sound pressure level to a reference level, typically the threshold of human hearing at 1 kHz. The decibel scale is logarithmic because the human perception of sound intensity covers a wide range, from the faintest sound we can hear to the threshold of pain.
The decibel scale allows us to express both very large and very small values of sound intensity conveniently. For example, normal conversation might range around 60-70 dB, while a jet engine at close range could exceed 140 dB. Decibels are used in various fields including acoustics, engineering, environmental noise monitoring, and occupational health and safety.
Options [B] Fathom and [C] Arg are not units of measurement for sound intensity. Therefore, among the options provided, the correct answer for the unit of measurement of sound intensity is the Decibel (dB).
See lessOn hearing thunder, a person opens his mouth so that
On hearing thunder, a person opens his mouth so that to equalize the air pressure on the eardrum of both the ears (Option [B]). Thunder is often accompanied by a sudden change in atmospheric pressure. By opening the mouth slightly, the person can equalize the pressure inside and outside the ear canaRead more
On hearing thunder, a person opens his mouth so that to equalize the air pressure on the eardrum of both the ears (Option [B]). Thunder is often accompanied by a sudden change in atmospheric pressure. By opening the mouth slightly, the person can equalize the pressure inside and outside the ear canal, reducing discomfort or pain caused by the pressure difference. This action helps prevent the eardrums from being pushed inward or outward abruptly, which can occur during rapid changes in air pressure.
Options [A] and [C] are less likely reasons because fear does not directly relate to opening the mouth, and opening the mouth does not significantly affect sound reception compared to the function of equalizing pressure. Option [D] is incorrect as opening the mouth is not primarily intended to expel air. Therefore, among the options provided, equalizing the air pressure on both eardrums is the most plausible reason for opening the mouth upon hearing thunder.
See less