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POPULATION INVERSION and LUMINOUS FLUX:
POPULATION INVERSION: The process in which number of electrons (N ) in a higher2 energy state called metastable state of an active medium is increased to a value greater than the number (N ) in the ground state (i.e. N > N ) is called population inversion.
LUMINOUS FLUX : The amount of radiant (light) energy following from a source of light per unit time is called luminous flux or light flux (Φ) . It is measured in lumens.
LUMINOUS INTENSITY : Luminous intensity of a point source of light is defined as the luminous flux emitted from it per unit solid angle.
It is otherwise called Illuminating power (I). It is measured in candela (cd).
A flat aluminum plate of 0.2 m thickness is initially at 120 Celsius. At time t=0, it is immersed in a liquid at 10 Celsius. Assume a very large heat transfer coefficient on both t
Differentiate between Fraunhofer's and Fresnel's type of diffraction?
#what are the condition necessary for heat transfer to occur?
How to find the acceleration of a body in a non inertial frame on the action of friction? Solution) Use the concept of pseudo force. Multiply the mass of the body of which you
Q. Explain why does heated air expand? Answer:- Temperature is habitually defined as the average thermal energy of the substance at hand. Therefore the hotter a substance
to find coefficient of viscosity of a liquid using stok''s law
give applications of resonance
Q. What is a frame of reference? A system of co-ordinate axes which describe the position of a particle in two or three dimensional space is called a frame of reference.
A boy throws a ball of mass 20 kg vertically upwards.It raises to a maximum height of 100 m.At what height will the kinetic energy be reduced to 70%?
Determine voltage gain for the circuit shown in figure below, with R F = 100K ? and R 1 =10 K? Ans. Determination of voltage gain: The provided operational
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