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.
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 less