1.

A bat emitting an ultrasonic wave of frequency 4.5 × 104 Hz at speed of 6 m/s between two parallel walls. The two frequencies heared by the bat will be

A. 4.67 × 104 Hz, 4.34 × 104 Hz
B. 4.34 × 104 Hz, 4.67 × 104 Hz
C. 4.5 × 104 Hz, 5.4 × 104 Hz
D. 4.67 × 103 Hz, 4.34 × 104 Hz
Answer» C. 4.5 × 104 Hz, 5.4 × 104 Hz


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