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(i) Time section of vibration of particle is described as the time taken by the particle to complete single vibration about its mean position.
(ii) It is the time given by the ray to travel a distance equivalent to one wavelength.
In X-ray tube, when high speed electrons strike the target, they move into the target. They lose their kinetic energy and come to rest inside the solid. The electron because of fin
why friction is called a necessery evil?
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