Question

6 (a) Define 'loudness' and 'pitch'.
(b)
State the effect on the-
(i) loudness of a sound when the amplitude of the vibrating body increases.
(ii) pitch of a sound when the frequency of the vibrating body increases.​

Answer 1

Answer:

Explanation:

Loudness of Sound

1 ) This phenomenon of a sound depending on the amplitude of the sound wave. If the amplitude of the sound wave is large, then the sound is said to be loud.

2) It is directly proportional to the square of the amplitude of vibration. If the amplitude of the sound wave becomes double, then the loudness of the sound will be quadrupled.

3) It is expressed in decibel (dB).

4) Sounds above 80 dB becomes noise to human ears.

(i) Loudness of sound depends upon the amplitude of vibration of vibrating object. More the amplitude of vibration, more is the loudness of the sound produced.

(ii) The pitch of a sound depends upon the frequency of the vibrating body, As the frequency of vibration becomes higher, the pitch also increases and the sound becomes more shrill.

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