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Problem 4: A bat flies towards a wall and emits a 5000 Hz sound wave. The...

Problem 4: A bat flies towards a wall and emits a 5000 Hz sound wave. The speed of sound in the air is 343 m/s.

              A: If the sound pulse takes 7 miliseconds to reflect off the wall and come back, how far from the wall is the bat?

              B: If the frequency observed by the bat of the reflected wave is 165 Hz higher, how fast is the bat approaching the wall?

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