Q57 of 199 Page 186

Explain why, a ringing bell suspended in a vacuum chamber cannot be heard outside.

As sound is a mechanical wave it cannot travel in vacuum. So, the bell ringing inside a vacuum chamber can not be heard.


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A wave is moving in air with a velocity of 340 m/s. Calculate the wavelength if its frequency is 512 vibrations/sec.

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The frequency of the sound emitted by the lioudspeaker is 1020 Hz. Calculate the wavelength of the sound wave in air in cm where its velocity is 340 m/s.

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What is the difference between a compression and a rarefaction in a sound wave? Illustrate your answer with a sketch.