Two sitar strings A and B playing the note 'Dha' are slightly out of tune and produce beats of frequency 5 Hz. When the tension in string B is slightly increased, the beat frequency falls by 3 Hz. If the frequency of A is 425 Hz, the original frequency of B was

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(3) 420 Hz. Five beats means B was at 420 Hz or 430 Hz. Raising the tension raises f_B; since the beat frequency fell, B moved towards 425 Hz, so it must have started below it. The original frequency of B was 420 Hz.

Two sitar strings A and B playing the note 'Dha' are slightly out of tune and produce beats of frequency 5 Hz. When the tension in string B is slightly increased, the beat frequency falls by 3 Hz. If the frequency of A is 425 Hz, the original frequency of B was

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