It is possible to hear the beats made by two ultrasonic waves of slightly differ

Question

It is possible to hear the beats made by two ultrasonic waves of slightly different frequencies? Why?

A)Yes. The beat frequency would have to be in the audible range, so the maximum frequency difference would be 20 kHz

B) No. The ultrasound frequency would have to be in the audible range with the maximum frequency would have to be in the above 20 kHz.

C)Yes. The Average frequency would have to be in the audible range with the maximum frequency below 20 kHz.

D)No. The beat frequency would above to be in the audible range, if the frequency difference would be above 20 kHz.

Explanation / Answer

A)Yes. The beat frequency would have to be in the audible range, so the maximum frequency difference would be 20 kHz

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