On sounding tuning fork A with another tuning fork B of frequency 384 Hz, 6 beats are produced per second. After loading the prongs of A with some wax and then sounding it again with B, 4 beats are produced per second. What is the frequency of the tuning fork A
Text Solution
Verified by ExpertsThe correct answer is:
D
n A = ?, n B = 384 Hz
x = 6 bps, which is decreasing (from 6 to 4) i.e. x ↓ ↓
Tuning fork A is loaded so n A ↓ ↓
Hence n A ↓ ↓ – n B = x ↓ ↓ Correct
n B – n A ↓ ↓ = x ↓ ↓ Wrong
⇒ ⇒ n A = n B + x = 384 + 6 = 390 Hz.
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