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Loudness and Pitch

Two tuning fo...

Question

Two tuning forks vibrate with the same amplitude but the frequency of the first is double the frequency of the second. Which fork produces more intense sound in air?

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Solution

We know that: intensity ∝ (amplitude)^2.
However, the intensity is independent of frequency. As the amplitude of the vibrating forks is the same, both the forks produce sounds of the same intensity in the air.

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