A string produces 5 beats/s with a 256 Hz fork. Loosening the string slightly gives 7 beats/s. The original frequency of the string was:

  1. 256 Hz
  2. 263 Hz
  3. 251 Hz
  4. 261 Hz
Answer

C) 251 Hz

Loosening lowers frequency; it moved further away, so it was below 256 Hz. SLO P-11-D-16 · Application

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