Two tunning forks P and Q when set vibration, gives 4 beats s-1 . If a prong of the fork P is filled, the beats are reduced to 2 beats s-1 . What is frequency of P, if that of Q is 250 Hz?
(a) 250 Hz
(b) 246 Hz
(c) 252 Hz
(d) 254 Hz
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Two tunning forks P and Q when set vibration, gives 4 beats s-1 . If a prong of the fork P is filled, the beats are reduced to 2 beats s-1 . What is frequency of P, if that of Q is 250 Hz?
(a) 250 Hz
(b) 246 Hz
(c) 252 Hz
(d) 254 Hz
Two tunning forks P and Q when set vibration, gives 4 beats s-1 . If a prong of the fork P is filled, the beats are reduced to 2 beats s-1 . What is frequency of P, if that of Q is 250 Hz?
(a) 250 Hz
(b) 246 Hz
(c) 252 Hz
(d) 254 Hz
Correct option (b) 246 Hz
Explanation:
Possible frequencies of P are: (250 ± 4) Hz i.e. 246 Hz, 254 Hz
When the prong of P is filled, its frequeney becomes greater than the original frequeney of P.
Also the frequency of P when the prong is filled reduces to 2 beats s-1 .
New possible frequencies of P are: (250 ± 2) Hz i.e. 248 Hz, 252 Hz
Since the new frequency increases from the original frequency.
So, the new frequency will be 246 Hz.