Beats are useful for tuning because:

  1. they change the speed of sound
  2. the human ear can detect very small frequency differences as slow beats
  3. they make sound louder permanently
  4. they polarize the sound
Answer

B) the human ear can detect very small frequency differences as slow beats

Very sensitive method. SLO P-11-D-16 · Application

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