MHT CET Physics question

For formation of beats, two sound notes must have [MHTCET 2019]

(A)different amplitudes and different frequencies
(B)exactly equal frequencies only
(C)exactly equal amplitudes only
(D)nearly equal frequencies and equal amplitudesCorrect

Answer: (D)

Solution

Beats need two notes of nearly equal (slightly different) frequencies, and for distinct beats with complete minima their amplitudes should be equal; widely different

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Question ID VK-070372