Complete the following sentences :

(a) The pitch of sound increases if its frequency ......................................

(b) If the amplitude of a sound is halved, its loudness becomes ......................

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Solution

(a) The pitch of sound increases if its frequency increases.

(b) If the amplitude of a sound is halved, its loudness becomes one-fourth.
This is because loudness or intensity is proportional to square of amplitude.

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Similar questions

State whether the following statements are true or false:

(a) Sound cannot travel in vacuum.

(b) The number of oscillations per second of a vibrating object is called its time-period.

(d) The lower the frequency of vibration, the higher is the pitch.

(e) If the amplitude of vibrations is doubled, the loudness of sound also gets doubled.

(f) When the amplitude of vibrations is halved, the loudness of sound becomes one-fourth.

(g) Unwanted or unpleasant sound is termed as music.

(h) Noise pollution may cause partial hearing impairment.

When we change a feeble sound to a loud sound, we increase its :

(a) frequency

(b) amplitude

(d) wavelength

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