Population inversion and luminous flux, Physics

Assignment Help:

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).

 

 


Related Discussions:- Population inversion and luminous flux

Mechanics, if acceleration vs time graph is given then how to calculate dis...

if acceleration vs time graph is given then how to calculate displacement

Kinematics, an object has moved through a distance.can it have zero displac...

an object has moved through a distance.can it have zero displacement?if yes support your answer with an example

Write an equation expressing interest rate, Q. Assume an economy is in a li...

Q. Assume an economy is in a liquidity trap. A. Write an equation expressing interest rate parity under a fixed exchange rate regime. Answer: Liquidity trap entail R = 0

PHYSICS PRACTICAL., I WANT SHORT THEORY OF DEFLECTION MANGNETOMETER TAN A& ...

I WANT SHORT THEORY OF DEFLECTION MANGNETOMETER TAN A& TAN B

Explain doppler effect, Whenever there is a relative speed among a source o...

Whenever there is a relative speed among a source of sound and the listener, the apparent frequency of sound listen by the listener is dissimilar from the real frequency of sound e

Candela, candela; cd The basic SI unit of luminous intensity described...

candela; cd The basic SI unit of luminous intensity described as the luminous intensity in a given direction of a source which emits monochromatic photons of frequency 540 x 1

PHYSICS, WHAT IS THE MEAN OF HEAT

WHAT IS THE MEAN OF HEAT

Mechanics, to derive expreation for magnitude & direction for the resultant...

to derive expreation for magnitude & direction for the resultant which two are acting at a point

Estimate the actual distance , You watch a distant carpenter driving his na...

You watch a distant carpenter driving his nails into the side of a house at a regular rate of 1 stroke per second.  You hear the sound of the blows exactly synchronized with the bl

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd