Q47 of 199 Page 207

What is meant by the ‘loudness’ of sound? On what factor does the loudness of a soind depend?

The measure of sound energy reaching per secon the ear is known as loudness of sound. Amplitude of the sound wave is responsible for it.


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What is a stethoscope? Name the principle on which a stethoscope works.

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What is a soundboard? Explain the working of a soundboard with the help of a labelled diagram.

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Draw labelled diagrams to represent (a) soft sound, and (b) loud sound, of the same frequency.

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Explain the term ‘pitch’ of a sound. On what factor does the ‘pitch’ of a sound depend?