Dolphins emit clicks of sound for communication and echolocation. A marine biolo

Question

Dolphins emit clicks of sound for communication and echolocation. A marine biologist is monitoring a dolphin swimming in seawater where the speed of sound is 1520 m/s. When the dolphin is swimming directly away at 5.4 m/s, the marine biologist measures the number of clicks occuring per second to be at a frequency of 2480 Hz. What is the difference (in Hz) between this frequency and the number of clicks per second actually emitted by the dolphin?

Explanation / Answer

Source moving towards a stationary observer formula is {F[s]} * { 1 / 1 - v[s]/v } Therefore in your case; --> {2480 Hz} * { 1 / 1 - 5.4 m/s / 1520 m/s} --> 2488.84 Hz --> 2489 Hz So taking away the actual figure from the biologist's we get 9 Hz, which is your answer. 100% sure!!!

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