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somecelxis
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Homework Statement
A stationary boat emits a sonar wave of frequency f to a school of fish which is moving a velocity u towards the boat. The sonar wave is then reflected by the school of fish. If v is the velocity of the sonar wave in water, the frequency of the wave reflected by the fish is
Homework Equations
The Attempt at a Solution
My ans is same as the working (first part) . I can't understand with the 2nd part . in my opinion, the frequency reflected by the fish is same as the frequency received by the fish . my ans is (( v+u)/ v ) x f . why ? is my concept wrong?