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

Conservation of momentum, In a pool game a .17kg cue ball traveling at .75 ...

In a pool game a .17kg cue ball traveling at .75 m/s in the plus x direction hits a stationary eight ball. The eight ball moves off with velocity of .25 m/s at an angle of 37 degre

Define pascal''s law, Pascal's principle describes that if the pressure is ...

Pascal's principle describes that if the pressure is operated at any position in an incompressible liquid it is send undiminished to all other sections in the liquid. In the dia

Degree of freedom of monoatomic gas, If instead of molecule, we assume a mo...

If instead of molecule, we assume a molecular of a monatomic gas, which having of a one atom, the translational motion can take place in any direction in space. Thus it can be solv

Determine the minimum amount of heat, A house is air conditioned using sola...

A house is air conditioned using solar energy. Solar radiation heats a pressurized tank such that the temperature is maintained at 175 o C. 1500 kJ must be extracted from the hous

Two positively charged particles at a separation, Questions: Regard as ...

Questions: Regard as two positively charged particles at a separation of 2.0 cm. One of the charged particles is shifting toward the other charged particle with a speed of 15 m

How fast must a spacecraft travel relative to the earth, How fast must a sp...

How fast must a spacecraft travel relative to the earth for each day on the spacecraft to correspond to 2d on the earth? By standard equation, for the time t to the earth to co

What is utilisation summary of every processor, Q. What is Utilisation Summ...

Q. What is Utilisation Summary of every processor? Utilisation Summary points to status of every processor it implies that how much time (in form of percentage) has been spent

How temperature of sun rays increase by sunlight reflected, Does sunlight r...

Does sunlight reflected off a mirror enhance the temperature of the sun-rays? A standard planar mirror will not enhance the energy contained in the rays that reflect off it. In

What is the interference, What is the Interference ? A single frequency ...

What is the Interference ? A single frequency light passing through a pair of closely spaced slits will show a pattern of vertical bands, due to alternating constructive and des

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