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  4. 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

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Q. 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

NTA AbhyasNTA Abhyas 2022Waves

Solution:

When tension is increased the frequency of the string increases from $n$ to $n \, + \, \Delta n$ . This means apparent frequency of the tuning fork has also increased from $n$ to $\left(n + \Delta n\right)$ . So the tuning fork is moving towards the string.