When a turning fork of unknown frequency if sounded with a tuning fork of frequency 100 Hz, 2 beats per second are heard. When the arm of tuning fork of unknown frequency is loaded with a little wax and both are sounded 1 beat per second is heard. The unknown frequency is :

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When a turning fork of unknown frequency if sounded with a tuning fork of frequency 100 Hz, 2 beats per second are heard. When the arm of tuning fork of unknown frequency is loaded with a little wax and both are sounded 1 beat per second is heard. The unknown frequency is :

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