ICSE Class 10 Physics 2016 Paper

The ratio of amplitude of two waves is $3: 4$ . What is the ratio of their :

Question : 14 of 73

Marks: +1, -0

loudness?

Solution:

Loudness of sound is directly proportional to the square of amplitude i.e.,

\;\text{ Loudness }\;\propto a^2

\;\text{ Ratio of Loudness }\;\;=\;\frac{a_1^2}{a_2^2}=\;\frac{(3)^2}{(4)^2}

\;=\;\frac{9}{16}=9:16

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