A) 258 Hz
B) 242 Hz
C) 262 Hz
D) 282 Hz
Correct Answer: A
Solution :
Since source of frequency x gives 8 beats per second with frequency 250 Hz, it's possible frequency are 258 or 242. As source of frequency x gives 12 beats per second with a frequency 270 Hz, it's possible frequencies 282 or 258 Hz. The only possible frequency of x which gives 8 beats with frequency 250 Hz also 12 beats per second with 258 Hz.
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