# NCERT Exemplar Solutions Class 9 Science Solutions for Sound - Exercise in Chapter 12 - Sound

Question 5 Sound - Exercise

When we change feeble sound to loud sound we increase its

(a) frequency

(b) amplitude

(c) velocity

(d) wavelength

The answer is (b) amplitude

Explanation:

The loudness of sound is proportional to amplitude. When amplitude increases feeble sound changes to loud sound.

Video transcript
"hello everyone welcome to lero learning i am gurpreet your science tutor today's question is when we change fever sound to loud sound we increase its a frequency b amplitude c velocity or d wavelength so out of the four options we have to find out which is the correct one when we change the feeble sound to a loud sound so let us start our answer loudness of a sound [Music] of a sound depends on amplitude that is loudness is proportional to amplitude this means when the amplitude increases the loudness will increase so the correct option for this question will be option b that is amplitude when we increase the amplitude of a feeble sound it will change to a loud sound for more such videos please subscribe leader learning and for any doubts drop a comment thank you"
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