Choose the one alternative that best completes the statement or answers the question. -A bat emits a sound at a frequency of 39.0 kHz as it approaches a wall. The bat

Choose the one alternative that best completes the statement or answers the question.
-A bat emits a sound at a frequency of 39.0 kHz as it approaches a wall. The bat detects beats with a frequency of 827 Hz between the sound it emits and the echo bouncing from the wall. What is the
Speed of the bat if the speed of sound in air is 343 m/s?
A) 9.0 m/s
B) 2.7 m/s
C) 3.6 m/s
D) 5.4 m/s
E) 3.0 m/s

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