# The Ratio of Amplitude of Two Waves is 3:4. What is the Ratio of Their Loudness? - Physics

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

#### Solution

Let a1 and a2 be the amplitudes and I1 and I2 be the intensities of the two waves.

:. I_1/I_2 = a_1^2/a_2^2 = 3^2/4^2

:. I_1/I_2 = 9/16

Concept: Properties of Sounds
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