Two tabla drums sound at $256$ Hz and $260$ Hz simultaneously. The beat frequency heard is:
A$516$ Hz, the sum of the two source frequencies
B$258$ Hz, the average pitch of the two drums
C$0$ Hz, since they superpose into one note silently
D$4$ Hz, the absolute difference of the frequencies
Answer & Solution
Correct answer: D. $4$ Hz, the absolute difference of the frequencies
Beat frequency $= |f_1 - f_2| = 4$ Hz.
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