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As a bat flies toward a wall at a speed of 5.20 m/sm/s , the bat...

As a bat flies toward a wall at a speed of 5.20 m/sm/s , the bat emits an ultrasonic sound wave with frequency 28.5 kHzkHz .

What frequency does the bat hear in the reflected wave?

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Here I upload solution, by two method, you can use anyone as you like. Thanks.

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