Physics
Grade-8
Easy
Question
Speed of light ____ speed of sound.
- >
- <
- =
- Any of the above
Hint:
The speed of light will be greater than the speed of sound.
The correct answer is: >
- Light travels faster than sound in any media.
- The speed of light and sound depends on the density of the media.
- The speed of light will be always greater than that of sound.
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1 kHz = ____Hz.
1 kHz = ____Hz.
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The SI unit of speed of sound is ____.
The SI unit of speed of sound is ____.
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The audible frequency range of an average human ear is ____.
- Sound which has frequency less than 20Hz is called infrasound.
- Sound which has frequency more than 20KHz is called Ultrasound.
The audible frequency range of an average human ear is ____.
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- Sound which has frequency less than 20Hz is called infrasound.
- Sound which has frequency more than 20KHz is called Ultrasound.
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The formula for calculating the speed of a sound wave is v = ____.
The formula for calculating the speed of a sound wave is v = ____.
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The distance covered by a sound wave in a unit time is called ____.
The distance covered by a sound wave in a unit time is called ____.
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The loudness of a sound decreases as we move away from a source of the sound. This is because _____.
The loudness of a sound decreases as we move away from a source of the sound. This is because _____.
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The loudness of sound I is ____ to the loudness of sound II.
The loudness of sound I is ____ to the loudness of sound II.
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