Two tuning forks of frequency 250 Hz and 256 Hz produce beats. If a maximum of intensity is observed just now, after how much time the minimum is observed at the same place ?
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Question

Two tuning forks of frequency 250 Hz and 256 Hz produce beats. If a maximum of intensity is observed just now, after how much time the minimum is observed at the same place ?

G1 Physics · Accepted Answer

Step 1: Beat frequency = |256−250|=6 Hz, so beat period = 1/6 s. Step 2: From an intensity maximum to the next minimum takes half a beat period = 1/12 s. Because minima repeat every 1/6 s, later valid minima include 1/4 s as well. Final: B and D.