In the example above, sticking wax on the unknown fork (lowering its frequency) increases the beats to 5/s. The unknown frequency was:

  1. 397 Hz
  2. 405 Hz
  3. 403 Hz
  4. 395 Hz
Answer

A) 397 Hz

Lowering 397 Hz moves it further from 400 Hz. SLO P-11-D-15 · Understanding

Physics MCQ · More Superposition, Stationary Waves and Beats MCQs · Practise