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CGP EDU Academic Team
Published on: September 12, 2026
If the pressure amplitude in a sound wave is tripled, then the intensity of sound is increased by a factor of
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A
From the relation intensity $\alpha$ (amplitude) $2I \propto a^{2}$ Hence, $\frac{I_1}{I_2} = \frac{a_1^2}{a_2^2} = \frac{a^2}{(3a)^2} = \frac{1}{9} \text{ so, } I_2 = 9I$
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