The reason thunder is heard long after the flash of lightning is; option [D] The speed of light is much greater than the speed of sound. Lightning, which causes thunder, emits light that travels at a speed of approximately 300,000,000 meters per second, much faster than the speed of sound at about 3Read more
The reason thunder is heard long after the flash of lightning is; option [D] The speed of light is much greater than the speed of sound. Lightning, which causes thunder, emits light that travels at a speed of approximately 300,000,000 meters per second, much faster than the speed of sound at about 343 meters per second in air. Consequently, the flash of lightning is seen almost instantly, while the sound of thunder takes longer to reach observers due to its slower propagation speed.
This delay allows us to estimate the distance of a lightning strike by counting the seconds between seeing the lightning and hearing the thunder (since sound travels approximately 1 kilometer in 3 seconds). The phenomenon underscores the fundamental difference in speed between light and sound waves, influencing how we perceive and interpret distant events like thunderstorms. Therefore, the correct answer explaining the delay is [D] The speed of light is much greater than the speed of sound.
Sound travels fastest through; option [A] Steel. The speed of sound in a material depends on its elasticity and density. Steel, being a dense and highly elastic solid, allows sound waves to propagate at speeds faster than in air, water, or vacuum. In steel, sound waves encounter less resistance andRead more
Sound travels fastest through; option [A] Steel. The speed of sound in a material depends on its elasticity and density. Steel, being a dense and highly elastic solid, allows sound waves to propagate at speeds faster than in air, water, or vacuum. In steel, sound waves encounter less resistance and can travel efficiently through its solid structure, making it useful in applications where rapid transmission of sound is necessary, such as in buildings, bridges, and machinery.
In contrast, sound travels much slower in air, water, and vacuum due to differences in their molecular structures and densities. Air, for example, has low density and elasticity compared to solids like steel, resulting in a slower speed of sound propagation. Therefore, among the substances listed, steel is the material through which sound travels the fastest due to its favorable acoustic properties.
If the pressure is doubled, the speed of sound in air remains; option [B] 332 m/sec. The speed of sound in a gas like air is primarily determined by its temperature. Under normal atmospheric conditions, changes in pressure do not significantly alter the speed of sound. This is because the relationshRead more
If the pressure is doubled, the speed of sound in air remains; option [B] 332 m/sec. The speed of sound in a gas like air is primarily determined by its temperature. Under normal atmospheric conditions, changes in pressure do not significantly alter the speed of sound. This is because the relationship between pressure and the speed of sound in gases is indirect and complex, with temperature having a more pronounced effect on the density and elasticity of the medium.
In practical terms, doubling the pressure in air at a constant temperature does not double the speed of sound. It would require extreme changes in pressure or modifications in temperature to significantly alter the speed of sound in air. Thus, under the conditions given, the correct answer remains [B] 332 m/sec, reflecting the stability of the speed of sound in air under varying pressure conditions within normal ranges.
Bats can fly in the dark because; option [C] They produce very intense sound waves which control it. Bats utilize echolocation, a biological sonar system where they emit high-frequency sound pulses and listen to the echoes bouncing off objects. By analyzing these echoes, bats can navigate complex enRead more
Bats can fly in the dark because; option [C] They produce very intense sound waves which control it. Bats utilize echolocation, a biological sonar system where they emit high-frequency sound pulses and listen to the echoes bouncing off objects. By analyzing these echoes, bats can navigate complex environments, locate prey, and avoid obstacles even in complete darkness. This ability is crucial for their survival and efficient hunting, allowing them to thrive in various habitats where visibility is limited.
Unlike birds, which rely primarily on vision for navigation and hunting, bats have evolved to use echolocation as a sophisticated sensory mechanism. Their large ears and specialized vocalizations enable them to emit and detect ultrasonic frequencies that are well-suited for navigating in the dark. This adaptation underscores the remarkable capabilities of bats in adapting to nocturnal lifestyles and thriving in diverse ecological niches. Thus, the correct answer regarding why bats can fly in the dark is [C] They produce very intense sound waves which control it.
Explosions are not heard on the Moon away from the surface; option [A] Due to the absence of atmosphere. Sound waves are mechanical waves that require a medium, such as air or water, to propagate. On the Moon, which lacks a substantial atmosphere, there are no air molecules to transmit sound waves fRead more
Explosions are not heard on the Moon away from the surface; option [A] Due to the absence of atmosphere. Sound waves are mechanical waves that require a medium, such as air or water, to propagate. On the Moon, which lacks a substantial atmosphere, there are no air molecules to transmit sound waves from explosions to an observer’s ears. Therefore, even though explosions create vibrations and shockwaves, these cannot be perceived audibly in the vacuum of space.
While the Moon’s lower gravity affects how materials behave and interact during explosions, it does not directly impact the propagation of sound waves. The absence of an atmosphere is the primary reason why sounds, including explosions, are not heard on the Moon’s surface or in its surrounding vacuum. Thus, the correct answer to why explosions are not heard on the Moon away from the surface is [A] Due to the absence of atmosphere.
Humans feel sound vibrations in the frequency range of; option [D] 20-20,000 Hz. This range is known as the audible spectrum because it includes frequencies that the human ear can detect and perceive as sound. Frequencies below 20 Hz are felt as vibrations rather than heard as distinct sounds and arRead more
Humans feel sound vibrations in the frequency range of; option [D] 20-20,000 Hz. This range is known as the audible spectrum because it includes frequencies that the human ear can detect and perceive as sound. Frequencies below 20 Hz are felt as vibrations rather than heard as distinct sounds and are referred to as infrasound. Frequencies above 20,000 Hz are considered ultrasonic and are typically beyond human auditory perception.
The ability to hear across this range enables humans to communicate through speech, appreciate music, and detect environmental sounds. The range also allows for various cultural and artistic expressions through sound and music. Understanding this frequency range is crucial in fields such as acoustics, audio engineering, and healthcare, where precise manipulation and perception of sound frequencies play significant roles.
The technique employed in cleaning the internal parts of planes is; option [A] Ultrasonic wave. Ultrasonic cleaning systems utilize high-frequency sound waves (typically above 20,000 Hz) to create microscopic bubbles in a cleaning solution. These bubbles implode near the surfaces being cleaned, dislRead more
The technique employed in cleaning the internal parts of planes is; option [A] Ultrasonic wave. Ultrasonic cleaning systems utilize high-frequency sound waves (typically above 20,000 Hz) to create microscopic bubbles in a cleaning solution. These bubbles implode near the surfaces being cleaned, dislodging dirt, grease, and other contaminants from intricate parts such as engine components, turbines, and hydraulic systems.
Ultrasonic cleaning is preferred in aviation maintenance for its ability to reach inaccessible areas and clean without abrasive scrubbing, reducing the risk of damage to sensitive parts. It effectively removes residues that can affect performance and safety without leaving behind chemical residues that might interfere with aircraft operations. This method enhances efficiency and safety in aircraft maintenance operations, contributing to the reliability and longevity of aviation equipment.
Thus, the correct answer for the technology used in cleaning the internal parts of planes is [A] Ultrasonic wave.
The pitch of sound primarily depends on; option [A] Frequency. Pitch is the perceptual attribute of sound related to its frequency, which is the number of vibrations per second. Higher frequencies result in higher-pitched sounds, while lower frequencies create lower-pitched sounds. This relationshipRead more
The pitch of sound primarily depends on; option [A] Frequency. Pitch is the perceptual attribute of sound related to its frequency, which is the number of vibrations per second. Higher frequencies result in higher-pitched sounds, while lower frequencies create lower-pitched sounds. This relationship between frequency and pitch is fundamental to how humans perceive and categorize sounds, influencing music, speech, and everyday auditory experiences.
Intensity, measured in decibels (dB), correlates with the loudness or amplitude of sound waves. While intensity affects the perceived volume, it does not determine pitch. Velocity refers to the speed of sound waves in a medium, which affects their propagation but not their pitch perception. Amplitude relates to the strength or magnitude of sound waves, impacting loudness but not the frequency that determines pitch.
Therefore, the correct answer regarding what the pitch of sound depends on is [A] Frequency, reflecting the direct relationship between frequency and the perceived pitch of a sound.
The technology used to ward off insects and harmful elements from homes is; option [A] Ultrasonic wave. Ultrasonic pest repellent devices emit high-frequency sound waves (typically above 20,000 Hz) that are inaudible to humans but irritating to pests such as insects, rodents, and spiders. These deviRead more
The technology used to ward off insects and harmful elements from homes is; option [A] Ultrasonic wave. Ultrasonic pest repellent devices emit high-frequency sound waves (typically above 20,000 Hz) that are inaudible to humans but irritating to pests such as insects, rodents, and spiders. These devices are designed to deter pests from entering or residing in the treated area by creating an uncomfortable environment through sound.
Ultrasonic pest control is favored for its non-toxic nature compared to traditional chemical methods. It’s commonly used in homes, offices, and other indoor spaces where pests are unwelcome. However, effectiveness can vary depending on factors like the type of pest, room layout, and frequency used. While ultrasonic waves can deter pests, they do not typically eliminate infestations already present and may require additional pest management strategies for comprehensive control.
Thus, the correct answer for technology used to repel insects and harmful elements from homes is [A] Ultrasonic wave.
The phenomenon used to detect prey, predators, or obstacles is; option [B] Formation of pulses. Echolocation, utilized by animals such as bats, dolphins, and some species of whales, involves emitting high-frequency sound pulses and interpreting the echoes that bounce back from objects in their envirRead more
The phenomenon used to detect prey, predators, or obstacles is; option [B] Formation of pulses. Echolocation, utilized by animals such as bats, dolphins, and some species of whales, involves emitting high-frequency sound pulses and interpreting the echoes that bounce back from objects in their environment. By analyzing the time it takes for the echoes to return and the intensity of the returning signals, these animals can accurately determine the location, size, and texture of nearby objects, aiding in navigation, hunting, and avoiding obstacles.
This biological adaptation relies on the formation of pulses of sound and the interpretation of the echoes received, highlighting the sophisticated sensory abilities of these species. Echolocation is not only crucial for survival but also serves as a model for technological applications in sonar and medical imaging, demonstrating its significance in both biological and engineering contexts. Thus, the correct answer is [B] Formation of pulses.
Thunder is heard long after the flash of lightning. The reason for this is
The reason thunder is heard long after the flash of lightning is; option [D] The speed of light is much greater than the speed of sound. Lightning, which causes thunder, emits light that travels at a speed of approximately 300,000,000 meters per second, much faster than the speed of sound at about 3Read more
The reason thunder is heard long after the flash of lightning is; option [D] The speed of light is much greater than the speed of sound. Lightning, which causes thunder, emits light that travels at a speed of approximately 300,000,000 meters per second, much faster than the speed of sound at about 343 meters per second in air. Consequently, the flash of lightning is seen almost instantly, while the sound of thunder takes longer to reach observers due to its slower propagation speed.
This delay allows us to estimate the distance of a lightning strike by counting the seconds between seeing the lightning and hearing the thunder (since sound travels approximately 1 kilometer in 3 seconds). The phenomenon underscores the fundamental difference in speed between light and sound waves, influencing how we perceive and interpret distant events like thunderstorms. Therefore, the correct answer explaining the delay is [D] The speed of light is much greater than the speed of sound.
See lessSound travels fastest through which of the following substances
Sound travels fastest through; option [A] Steel. The speed of sound in a material depends on its elasticity and density. Steel, being a dense and highly elastic solid, allows sound waves to propagate at speeds faster than in air, water, or vacuum. In steel, sound waves encounter less resistance andRead more
Sound travels fastest through; option [A] Steel. The speed of sound in a material depends on its elasticity and density. Steel, being a dense and highly elastic solid, allows sound waves to propagate at speeds faster than in air, water, or vacuum. In steel, sound waves encounter less resistance and can travel efficiently through its solid structure, making it useful in applications where rapid transmission of sound is necessary, such as in buildings, bridges, and machinery.
In contrast, sound travels much slower in air, water, and vacuum due to differences in their molecular structures and densities. Air, for example, has low density and elasticity compared to solids like steel, resulting in a slower speed of sound propagation. Therefore, among the substances listed, steel is the material through which sound travels the fastest due to its favorable acoustic properties.
See lessThe speed of sound in air is 332 meters per second. If the pressure is increased to double then the speed of sound will be
If the pressure is doubled, the speed of sound in air remains; option [B] 332 m/sec. The speed of sound in a gas like air is primarily determined by its temperature. Under normal atmospheric conditions, changes in pressure do not significantly alter the speed of sound. This is because the relationshRead more
If the pressure is doubled, the speed of sound in air remains; option [B] 332 m/sec. The speed of sound in a gas like air is primarily determined by its temperature. Under normal atmospheric conditions, changes in pressure do not significantly alter the speed of sound. This is because the relationship between pressure and the speed of sound in gases is indirect and complex, with temperature having a more pronounced effect on the density and elasticity of the medium.
In practical terms, doubling the pressure in air at a constant temperature does not double the speed of sound. It would require extreme changes in pressure or modifications in temperature to significantly alter the speed of sound in air. Thus, under the conditions given, the correct answer remains [B] 332 m/sec, reflecting the stability of the speed of sound in air under varying pressure conditions within normal ranges.
See lessBats can fly in the dark because
Bats can fly in the dark because; option [C] They produce very intense sound waves which control it. Bats utilize echolocation, a biological sonar system where they emit high-frequency sound pulses and listen to the echoes bouncing off objects. By analyzing these echoes, bats can navigate complex enRead more
Bats can fly in the dark because; option [C] They produce very intense sound waves which control it. Bats utilize echolocation, a biological sonar system where they emit high-frequency sound pulses and listen to the echoes bouncing off objects. By analyzing these echoes, bats can navigate complex environments, locate prey, and avoid obstacles even in complete darkness. This ability is crucial for their survival and efficient hunting, allowing them to thrive in various habitats where visibility is limited.
Unlike birds, which rely primarily on vision for navigation and hunting, bats have evolved to use echolocation as a sophisticated sensory mechanism. Their large ears and specialized vocalizations enable them to emit and detect ultrasonic frequencies that are well-suited for navigating in the dark. This adaptation underscores the remarkable capabilities of bats in adapting to nocturnal lifestyles and thriving in diverse ecological niches. Thus, the correct answer regarding why bats can fly in the dark is [C] They produce very intense sound waves which control it.
See lessExplosions are not heard on the Moon away from the surface
Explosions are not heard on the Moon away from the surface; option [A] Due to the absence of atmosphere. Sound waves are mechanical waves that require a medium, such as air or water, to propagate. On the Moon, which lacks a substantial atmosphere, there are no air molecules to transmit sound waves fRead more
Explosions are not heard on the Moon away from the surface; option [A] Due to the absence of atmosphere. Sound waves are mechanical waves that require a medium, such as air or water, to propagate. On the Moon, which lacks a substantial atmosphere, there are no air molecules to transmit sound waves from explosions to an observer’s ears. Therefore, even though explosions create vibrations and shockwaves, these cannot be perceived audibly in the vacuum of space.
While the Moon’s lower gravity affects how materials behave and interact during explosions, it does not directly impact the propagation of sound waves. The absence of an atmosphere is the primary reason why sounds, including explosions, are not heard on the Moon’s surface or in its surrounding vacuum. Thus, the correct answer to why explosions are not heard on the Moon away from the surface is [A] Due to the absence of atmosphere.
See lessIn which frequency range do humans feel sound vibrations?
Humans feel sound vibrations in the frequency range of; option [D] 20-20,000 Hz. This range is known as the audible spectrum because it includes frequencies that the human ear can detect and perceive as sound. Frequencies below 20 Hz are felt as vibrations rather than heard as distinct sounds and arRead more
Humans feel sound vibrations in the frequency range of; option [D] 20-20,000 Hz. This range is known as the audible spectrum because it includes frequencies that the human ear can detect and perceive as sound. Frequencies below 20 Hz are felt as vibrations rather than heard as distinct sounds and are referred to as infrasound. Frequencies above 20,000 Hz are considered ultrasonic and are typically beyond human auditory perception.
The ability to hear across this range enables humans to communicate through speech, appreciate music, and detect environmental sounds. The range also allows for various cultural and artistic expressions through sound and music. Understanding this frequency range is crucial in fields such as acoustics, audio engineering, and healthcare, where precise manipulation and perception of sound frequencies play significant roles.
See lessWhat is used in cleaning the internal parts of planes?
The technique employed in cleaning the internal parts of planes is; option [A] Ultrasonic wave. Ultrasonic cleaning systems utilize high-frequency sound waves (typically above 20,000 Hz) to create microscopic bubbles in a cleaning solution. These bubbles implode near the surfaces being cleaned, dislRead more
The technique employed in cleaning the internal parts of planes is; option [A] Ultrasonic wave. Ultrasonic cleaning systems utilize high-frequency sound waves (typically above 20,000 Hz) to create microscopic bubbles in a cleaning solution. These bubbles implode near the surfaces being cleaned, dislodging dirt, grease, and other contaminants from intricate parts such as engine components, turbines, and hydraulic systems.
Ultrasonic cleaning is preferred in aviation maintenance for its ability to reach inaccessible areas and clean without abrasive scrubbing, reducing the risk of damage to sensitive parts. It effectively removes residues that can affect performance and safety without leaving behind chemical residues that might interfere with aircraft operations. This method enhances efficiency and safety in aircraft maintenance operations, contributing to the reliability and longevity of aviation equipment.
Thus, the correct answer for the technology used in cleaning the internal parts of planes is [A] Ultrasonic wave.
See lessOn what does the pitch of sound depend?
The pitch of sound primarily depends on; option [A] Frequency. Pitch is the perceptual attribute of sound related to its frequency, which is the number of vibrations per second. Higher frequencies result in higher-pitched sounds, while lower frequencies create lower-pitched sounds. This relationshipRead more
The pitch of sound primarily depends on; option [A] Frequency. Pitch is the perceptual attribute of sound related to its frequency, which is the number of vibrations per second. Higher frequencies result in higher-pitched sounds, while lower frequencies create lower-pitched sounds. This relationship between frequency and pitch is fundamental to how humans perceive and categorize sounds, influencing music, speech, and everyday auditory experiences.
Intensity, measured in decibels (dB), correlates with the loudness or amplitude of sound waves. While intensity affects the perceived volume, it does not determine pitch. Velocity refers to the speed of sound waves in a medium, which affects their propagation but not their pitch perception. Amplitude relates to the strength or magnitude of sound waves, impacting loudness but not the frequency that determines pitch.
Therefore, the correct answer regarding what the pitch of sound depends on is [A] Frequency, reflecting the direct relationship between frequency and the perceived pitch of a sound.
See lessIt is used to ward off insects and harmful elements from homes
The technology used to ward off insects and harmful elements from homes is; option [A] Ultrasonic wave. Ultrasonic pest repellent devices emit high-frequency sound waves (typically above 20,000 Hz) that are inaudible to humans but irritating to pests such as insects, rodents, and spiders. These deviRead more
The technology used to ward off insects and harmful elements from homes is; option [A] Ultrasonic wave. Ultrasonic pest repellent devices emit high-frequency sound waves (typically above 20,000 Hz) that are inaudible to humans but irritating to pests such as insects, rodents, and spiders. These devices are designed to deter pests from entering or residing in the treated area by creating an uncomfortable environment through sound.
Ultrasonic pest control is favored for its non-toxic nature compared to traditional chemical methods. It’s commonly used in homes, offices, and other indoor spaces where pests are unwelcome. However, effectiveness can vary depending on factors like the type of pest, room layout, and frequency used. While ultrasonic waves can deter pests, they do not typically eliminate infestations already present and may require additional pest management strategies for comprehensive control.
Thus, the correct answer for technology used to repel insects and harmful elements from homes is [A] Ultrasonic wave.
See lessWhich phenomenon is used to detect prey, predators or obstacles?
The phenomenon used to detect prey, predators, or obstacles is; option [B] Formation of pulses. Echolocation, utilized by animals such as bats, dolphins, and some species of whales, involves emitting high-frequency sound pulses and interpreting the echoes that bounce back from objects in their envirRead more
The phenomenon used to detect prey, predators, or obstacles is; option [B] Formation of pulses. Echolocation, utilized by animals such as bats, dolphins, and some species of whales, involves emitting high-frequency sound pulses and interpreting the echoes that bounce back from objects in their environment. By analyzing the time it takes for the echoes to return and the intensity of the returning signals, these animals can accurately determine the location, size, and texture of nearby objects, aiding in navigation, hunting, and avoiding obstacles.
This biological adaptation relies on the formation of pulses of sound and the interpretation of the echoes received, highlighting the sophisticated sensory abilities of these species. Echolocation is not only crucial for survival but also serves as a model for technological applications in sonar and medical imaging, demonstrating its significance in both biological and engineering contexts. Thus, the correct answer is [B] Formation of pulses.
See less