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Question
A fork of unknown frequency gives 4 beats/sec when sounded with another fork of frequency 256Hz. The fork is now loaded with a piece of wax and again 4 beats/sec are heard .Then the frequency of the unknown fork is :
A fork of unknown frequency gives 4 beats/sec when sounded with another fork of frequency 256Hz. The fork is now loaded with a piece of wax and again 4 beats/sec are heard .Then the frequency of the unknown fork is :
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Solution
The correct option is B 260 Hz
on putting wax on tuning fork prong's its frequency decreases , as no of beats after reduction in frequency are same means that frequency of unknown fork is higher than given fork . so frequency of unknown fork f=256+4f=260so answer is D.
on putting wax on tuning fork prong's its frequency decreases , as no of beats after reduction in frequency are same means that frequency of unknown fork is higher than given fork .
so frequency of unknown fork f=256+4
f=260
so answer is D.
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