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What is the stimulated emission? Define this term briefly.
Stimulated emission:
a. While photon interacts along with atom that is in the excited state E2, in that case de-excitation of this atom to the lower energy state E1 arises with emission of photon of energy hν. Thus, stimulated emission is the process by that, while perturbed by
a photon, matter may lose energy resulting into the creation of other photon.
b. The perturbing photon is not vanished within the process, and the second photon is created with similar phase, frequency and direction as well as polarization of travel as the original.
c. The process can be consideration of as "optical amplification" and this forms the origin of both the laser and maser.Stimulated emission.
A monochromatic light of wavelength 6000Å is incident on a plane diffraction grating with grating element 6 X 10 -5 cm. Evaluate the maximum order of spectrum that will be observe
The lead alloy: Most of the soldering in the electronic industry is carried out using tin lead alloy. Pure lead metals at 327 0 C, whereas tin melts at 232 0 C and the mixture of
Q. Give the basic assumptions made in free electron model of solid. OR Write down basic postulates of Sommerfield's free electron gas model. Show that the number of ene
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Illustrate the first law of thermodynamics for a closed system undergoing cyclic process.
Light with a wavelength of 454.5 nm passes by two slits that are 95.2 cm from a screen. The distance among the centers of the central band and the first-order band is 15.2 mm.
The order of density in nucleus is: (1)10 8 kg/cc (2)10 -8 kg/ cc (3)10 - 9kg/cc (4)10 12 kg/cc Ans; (4)10 12 kg/cc
What occurs if electrical connection or electrical joint is loose? Ans: Because of loose connection at joints resistance at that point will increase thereby the I²R loses ar
An electron in a hydrogen atom makes a transition from E 3 to E 1 . How much energy does the atom lose?
on air pollution
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