A tuning fork is in resonance with a vibrating string under tension. When the tuning fork is moved with a certain velocity, 2 beats per second are heard. If the tension is increased, the beats disappear again. The direction of motion of the tuning fork is

Question

A tuning fork is in resonance with a vibrating string under tension. When the tuning fork is moved with a certain velocity, 2 beats per second are heard. If the tension is increased, the beats disappear again. The direction of motion of the tuning fork is, towards the string, away from the string, random, unpredictable as data is not sufficient

MARKS App · Accepted Answer

When tension is increased the frequency of the string increases from n to n + ∆ n . This means apparent frequency of the tuning fork has also increased from n to n + ∆ n . So the tuning fork is moving towards the string.

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