Iit jee 2019

Why is sound of thunder heard much later than the observation of lightning?

Que. Why is sound of thunder heard much later than the observation of lightning? 

Ans. Velocity of light is much more than that of the sound. While the velocity of light is 3 x 108 m/s, the velocity of sound is only 332 m/s. During thunder although sound and light are produced at the same time, they take different times to reach the observer. While the light reaches almost instantaneously, the sound takes some time to reach the listener.
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19th April 2019

Aakashshaw

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Will there be resonance with a tuning fork if the length of the sonometer wire be do

Que. Will there be resonance with a tuning fork if the length of the  sonometer wire be doubled or halved, while other factors remains unaltered?

Ans. A type of virtual resonance takes place. The amplitude of vibration would increase but not as much as in the case of real resonance. When the length of the wire is half the length for the real resonance, than the tuning fork supplies energy for every alternate vibration of the string. When the length the wire is double then, energy is supplied in every half a vibration.

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19th April 2019

Aakashshaw

By