A tuning fork of frequency 100 Hz when sound together with …

Physics Wave and Sound All Topic Question for Revision Test MCQ (Single Correct)

A tuning fork of frequency 100 Hz when sound together with another tuning fork of unknown frequency produces 2 beats per second. On loading the tuning fork whose frequency is not known and sounded together with the same tuning fork produces one beat, then the frequency of the unknown tuning fork (in Hz) is

102

101

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The correct answer is:

Unknown frequency may be 102 Hz or 98 Hz. On loading this tuning fork, its frequency will decrease. Suppose they become 101 Hz or 97 Hz. With 100 Hz, beat frequency will be 1 Hz or 3 Hz. Given frequency is 1 Hz. Hence, unknown frequency should be 101 Hz.

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