Two tuning forks give some beats; each is in unison with a slightly different length of the same sonometer wire; find their frequencies

1. A.
   383 Hz, 388 Hz
2. B.
   388 Hz, 392 Hz
3. C.
   475 Hz, 480 Hz
4. D.
   480 Hz, 485 Hz

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1. A.
   $320\text{ }Hz,326\text{ }Hz$
2. B.
   $414\text{ }Hz,420\text{ }Hz$
3. C.
   $420\text{ }Hz,426\text{ }Hz$
4. D.
   $480\text{ }Hz,486\text{ }Hz$

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1. A.
   $96\text{ }Hz,92\text{ }Hz$
2. B.
   $92\text{ }Hz,88\text{ }Hz$
3. C.
   $72\text{ }Hz,68\text{ }Hz$
4. D.
   $48\text{ }Hz,44\text{ }Hz$

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