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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