A tuning fork of 400 Hz and an unknown fork give 3 beats/s. The unknown frequency is:

  1. 1200 Hz
  2. 133 Hz
  3. 397 Hz or 403 Hz
  4. exactly 403 Hz
Answer

C) 397 Hz or 403 Hz

f = 400 pm 3. SLO P-11-D-15 · Understanding

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