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Q. What are the conditions to achieve the laser action?
Conditions to achieve laser action
(i) There should be an inverted population that is more atoms in the excited state than in the ground state.
(ii) The excited state should be a metastable state.
(iii) The emitted photons should stimulate further emission. This is achieved by the utilize of the reflecting mirrors at the ends of the system.
Determine and plot the ratios μtr/μ and μab/μ from 5 keV to 100 MeV for (a) air, (b) water, (c) muscle, (d) bone, and (d) lead. Use the excel data file and use lo
Printing Paper Industry: Synchronous motors are used in grinders. DC drives are used for pumping pulp and refining it.
A sphere of radius R touches two adjacent sides of a room.It also touches an inclined plane at a height of R/5 from the floor.the inclined plane moves towards the sphere at the spe
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Q. In Young's double slit experiment, the width of the fringe obtained with light of wavelength 60000A is 2 mm. Calculate the fringe width if the entire apparatus is immersed in a
(a) State the postulate of STR and deduce Lorentz Transformation. OR Give basic postulate of special theory of relativity. Derive Lorentz Transformation equations. (b) Pro
How do I make a terrestrial telescope?
how to use instruments like Vernier calipers and micro screw gauge to measure round objects
Explain thew laws of physics It is thought that the laws of physics do not change from place to place. This is why experiments carried out in different countries by dissimilar
Electrical materials: Materials which allow an electric current to flow easily are known as conductors and those which prevent the flow of an appreciable current are known as i
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