As a bat flies toward a wall at a speed of 6.0 m/s, the bat emits an ultrasonic sound wave with frequency 30.0 khz. what frequency does the bat hear in the reflected wave?

Explanation:

speed of bat = 6 m/s

sound wave frequency emitted by bat = 30.0 kHz

as we know,

speed of sound (c)= 343 m/s

now frequency received by bat is equal to  

hence the frequency hear by bat will be 29.98 Hz

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