- #1
Lotto
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- Homework Statement
- A bat is flying with a speed
perpendicular to a wall and is sending ultrasound waves of frequency and of speed . The waves are reflecting from the wall. What frequency will the bat hear?
- Relevant Equations
The wavelength of the sent waves is . Reflected waves will maintain this wavelength. For the bat, the reflected wave's speed is , so relative to the bat, its frequency is . Since the difference between frequencies of the initial and the reflected waves is small, it will interfere and create beats of frequency .
In my textbook, the answer is , so I am confused. Is my solution wrong?
In my textbook, the answer is