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For this problem on the topic of sound waves, we are told that there are two ships moving due east along a line.
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The trailing ship has a speed of 64 kilometres an hour relative to land, and the leading ship has a speed of 45 kilometers per hour relative to the same point.
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The two ships are in a region of the ocean where the current is moving due west at a speed of 10 kilometers an hour.
00:26
And we are told that the trailing ship then sends out a sonar signal with a frequent.
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Of 1 ,200 hertz.
00:33
We want to know the frequency that is observed by the leading ship, given the speed of sound and water to be 1 ,520 meters per second.
00:42
Now, when the observer is moving in front of and in the same direction as the source, by the doppel effect equation, we have f prime is equal to the source frequency f into v minus the speed of the observer vo, over the speed of sound in water v, v, minus the speed of the source v...