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Lasers produce an intense coherent beam of light because the waves have the same frequency, are in phase with each other and have a low divergence.
The phenomenon this question relates to is the photoelectric effect, and it can only be explained using Einstein’s photon model of light.Electromagnetic waves are emitted in discret...
(a) A frequency of 440 Hz means that a single trough and peak of the sound wave oscillates 440 times per second or equally that 440 sound waves are produced by the keyboard per second (This is because ...
A bullet is fired horizontally from a rifle 1.5m from the ground at 430m/s. How far does it travel and for how long does it travel before it hits the ground?Assuming that air re...
Stimulated emission occurs under the specific circumstances of a population inversion, that is, when there are more electrons in a higher energy level than one below it. There will be a certain energy ...
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