The Bird & Fish Problem

A bird moving vertically downwards observes a fish moving vertically upwards with a velocity \( 12 \text{ m/s}\). The fish observes the bird moving down with \(16 \text{ m/s}\).

Take the refractive index of water as 4/3. The bird emits a sound of frequency \(320 \text{ Hz}\). Find the frequency of sound heard by the fish.

Assume the velocity of sound in air as \( 329\text{ m/s} \) and the velocity of sound in water as \( 1316\text{ m/s}\).

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