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Question: A diver underwater sees a dolphin swimming towards him with a speed of 11.637 m/s.11.637...

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A diver underwater sees a dolphin swimming towards him with a speed of 11.637 m/s.11.637 m/s. The diver gets excited and swims towards the dolphin with a speed of 15.839 m/s.15.839 m/s.The dolphin sees the diver and emits a call with a frequency of 25.40 kHz.25.40 kHz. Assume that the speed of sound through the water is 1470 m/s.1470 m/s.

Part 1)

What frequency does the diver detect coming from the dolphin?

f=  kHz

Part 2)

The sound is reflected off the diver back to the dolphin. What frequency does the dolphin detect?

f=  kHz

Part 3)

Suppose now that there is a strong current with a speed of 1.169 m/s1.169 m/s in the same direction as the dolphin. What is the new frequency the dolphin detects? (Give your answer to 4 significant figures).

f=  kHz

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