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Illustrate the A and B coefficients of Einstein in shortly.
Einstein’s A and B coefficients:
Einstein suggested a mathematical expression for the existence of stimulated emission of light that is termed as Einstein’s expression.
Into atomic system, each three transition processes as stimulated absorption, spontaneous emission and stimulated emission happen simultaneously. While photons interact along with atoms, both upward i.e., absorption and downward i.e., emission transitions happen. At equilibrium such transition rates should be equal.
Light is able to travel through vacuum Ans: In classical physics electromagnetic radiation (light) is the only kind of wave that doesn't need a medium. For sound rays in a
Ascooter acquires velocity of 36km/hr in 10 secs just after the start and stops after 20 secs. Find the acceleration in both cases.
It is significant to denote the time interval to in which we are talking about average. In a given time interval t 1 to t 2 the average angular acceleration is defined as ,
Negative feedback principle: The idea that in a system where there are self-propagating conditions, those new conditions tend to act against earlier existing circumstances. Su
Reflection law For a wavefront intersecting reflecting surface, the angle of incidence is equivalent to the angle of reflection, in the similar plane described by the ray of i
How is glass fibre material in optical fibres used? Glass fibre material in optical fibres: Silica is the generally used materials for the manufacture of a glass fibre. The
Distinguish among diamagnetic and ferromagnetic materials in respect of their (i) intensity of magnetisation, (ii) behaviour in a non-uniform magnetic field and (iii) susceptibilit
In structuring the image does light from the object necessarily pass through the location of the image? Ans: No In reality in the case of a plane mirror (defining the obje
How does laser printer works? When a text or image is entered into the CPU, it makes a series of varying voltages. This controls a LED (light emitting diode) in the printer. Th
a rocket is projected upwards with a velocity of 490. find te time taken to reach the ground
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