Q41 of 47 Page 13

How does the loudness of sound depend upon the amplitude? Explain giving example.

Loudness of sound is proportional to the square of the amplitude of vibrations producing the sound. For example, if the amplitude becomes twice the loudness increases by a factor of 4.

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39 What is the audible range of frequencies for human beings? Explain. 40 Which range of frequencies are used in ultrasound equipments? Explain various uses of ultrasound. 42 What is the unit of the loudness of sound? Explain giving the loudness of few sounds. 43 What is noise pollution? What are its major causes?