ICSE Class 10 Physics 2016 Solved 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 "\; ∝ a^2

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

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

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