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.
The instrument used to detect submerged objects is called "Sonar" (Option [B]). Sonar stands for Sound Navigation and Ranging. It works by emitting sound waves into water and then detecting the echoes reflected back from underwater objects, such as submarines, ships, or even the seafloor. By measuriRead more
The instrument used to detect submerged objects is called “Sonar” (Option [B]). Sonar stands for Sound Navigation and Ranging. It works by emitting sound waves into water and then detecting the echoes reflected back from underwater objects, such as submarines, ships, or even the seafloor. By measuring the time it takes for the sound waves to return, sonar systems can calculate the distance to these objects and create detailed maps of underwater environments.
Sonar technology is crucial for various applications, including military defense, underwater exploration, navigation, fishing, and marine research. There are different types of sonar systems, such as passive sonar (listening for sounds generated by objects) and active sonar (emitting pulses of sound and analyzing the returning echoes). This technology enables ships to navigate safely through underwater hazards, helps fishermen locate schools of fish, aids in the search and recovery of submerged objects, and supports scientific investigations of oceanography and marine biology.
Options [A] Radar, [C] Quasar, and [D] Pulser are not instruments used for detecting submerged objects, distinguishing them from sonar in underwater detection applications.
The standard sound level for humans is 60 dB (Option [B]). This level corresponds to the threshold of normal conversation or background noise in a quiet room. It serves as a reference point in assessing the loudness of sounds encountered in everyday environments. Sound levels above 85 dB over extendRead more
The standard sound level for humans is 60 dB (Option [B]). This level corresponds to the threshold of normal conversation or background noise in a quiet room. It serves as a reference point in assessing the loudness of sounds encountered in everyday environments. Sound levels above 85 dB over extended periods can lead to hearing damage, while levels exceeding 120 dB are considered very loud and may cause discomfort or immediate hearing impairment.
Sound level measurements are logarithmic and relate to the intensity of sound waves. A 10 dB increase represents a tenfold increase in sound intensity, meaning 70 dB is ten times more intense than 60 dB. Noise exposure guidelines recommend limiting exposure to levels above 85 dB for extended periods to prevent hearing loss. Various occupational safety regulations and environmental noise standards use dB measurements to assess and mitigate the impact of noise on human health and wellbeing. Therefore, among the options provided, 60 dB is considered the standard sound level for typical human hearing conditions.
Light 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 lessThe instrument used to detect submerged objects is called
The instrument used to detect submerged objects is called "Sonar" (Option [B]). Sonar stands for Sound Navigation and Ranging. It works by emitting sound waves into water and then detecting the echoes reflected back from underwater objects, such as submarines, ships, or even the seafloor. By measuriRead more
The instrument used to detect submerged objects is called “Sonar” (Option [B]). Sonar stands for Sound Navigation and Ranging. It works by emitting sound waves into water and then detecting the echoes reflected back from underwater objects, such as submarines, ships, or even the seafloor. By measuring the time it takes for the sound waves to return, sonar systems can calculate the distance to these objects and create detailed maps of underwater environments.
Sonar technology is crucial for various applications, including military defense, underwater exploration, navigation, fishing, and marine research. There are different types of sonar systems, such as passive sonar (listening for sounds generated by objects) and active sonar (emitting pulses of sound and analyzing the returning echoes). This technology enables ships to navigate safely through underwater hazards, helps fishermen locate schools of fish, aids in the search and recovery of submerged objects, and supports scientific investigations of oceanography and marine biology.
Options [A] Radar, [C] Quasar, and [D] Pulser are not instruments used for detecting submerged objects, distinguishing them from sonar in underwater detection applications.
See lessStandard sound level for humans is
The standard sound level for humans is 60 dB (Option [B]). This level corresponds to the threshold of normal conversation or background noise in a quiet room. It serves as a reference point in assessing the loudness of sounds encountered in everyday environments. Sound levels above 85 dB over extendRead more
The standard sound level for humans is 60 dB (Option [B]). This level corresponds to the threshold of normal conversation or background noise in a quiet room. It serves as a reference point in assessing the loudness of sounds encountered in everyday environments. Sound levels above 85 dB over extended periods can lead to hearing damage, while levels exceeding 120 dB are considered very loud and may cause discomfort or immediate hearing impairment.
Sound level measurements are logarithmic and relate to the intensity of sound waves. A 10 dB increase represents a tenfold increase in sound intensity, meaning 70 dB is ten times more intense than 60 dB. Noise exposure guidelines recommend limiting exposure to levels above 85 dB for extended periods to prevent hearing loss. Various occupational safety regulations and environmental noise standards use dB measurements to assess and mitigate the impact of noise on human health and wellbeing. Therefore, among the options provided, 60 dB is considered the standard sound level for typical human hearing conditions.
See less