The device that produces an intense, monochromatic and coherent beam of light based on stimulated emission of photons from atoms, is called __________. (Laser, x-ray tube, discharge tube, cyclotron

Asked by Narendra Kumar Sharma 19/02/2015 Last Modified 07/10/2025

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__________ theory explains that energy exchange takes place in discrete “bundles” or “quanta”. (Special theory of Relativity, Quantum Theory, Corpuscular Theory, Bohr’s Theory)

Quantam theory

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In a hydrogen atom the radius of the electron orbit is governed by Bohr’s quantum rule which states that __________. (the linear momentum of the electron is quantised, the angular momentum of the electron is quantised, the linear velocity of the electron is quantised, the angular velocity of the electron is quantised)

angular momentum of the electron is quantised

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. The photoelectric emission from the surface of a metal starts only when the light incident on the surface has a certain __________. (minimum frequency, minimum wavelength, minimum intensity, minimum speed)

minimum frequency

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X-rays are produced when an element of high atomic weight is bombarded by high energy __________. (Protons, Electrons, Neutrons, Photons

Electrons

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The device that produces an intense, monochromatic and coherent beam of light based on stimulated emission of photons from atoms, is called __________. (Laser, x-ray tube, discharge tube, cyclotron

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