A vibrating guitar string emits a tone simultaneously with one from a 500-Hz tuning fork.If a beat frequency of 4 Hz results,what is the frequency of vibration of the string?
A) 2500 Hz
B) 496 Hz
C) 504 Hz
D) Either choice B or C is valid.

Question

Quizplus · Accepted Answer

The beat frequency is the absolute difference between the two frequencies. Therefore, the string could be vibrating at either 496 Hz (500 Hz - 4 Hz) or 504 Hz (500 Hz + 4 Hz).

A Vibrating Guitar String Emits a Tone Simultaneously with One