From the original beat frequency of 3 Hz, you know that the "other" fork has a frequency of either 507 or 513 Hz.
If you lower the frequency of the 510 Hz fork and get a higher beat frequency, the "other" fork must have the higher 513 Hz frequency, NOT 507.
When two tuning forks are stuck simultaneously, 3 beats per second are heard. The frequency of one fork is 510 Hz. A piece of wax is placed on the 510 Hz fork to lower its frequency slightly. If the beat frequency is increased, what is
the correct frequency for the second fork?
Answer in units of Hz
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