A bat emits ultrasonic waves of frequency 39 kHz and receives and echo 0.2 s later. If the speed of sound in air is 300 m/s and the speed of electro m
A bat emits ultrasonic waves of frequency 39 kHz and receives and echo 0.2 s later. If the speed of sound in air is 300 m/s and the speed of electro magnetic waves `3 xx 10^(8) m//s` then the distance of the bat from the object producing the echo is
A. 60 m
B. 30 m/s
C. `3 xx 10^(7) m`
D. `3 xx 10^(6) m`
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