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

Ac input resistance in common emitter configuration, AC Input Resistance in...

AC Input Resistance in Common Emitter Configuration Ratio of change in base emitter  voltage  ( ? V BE )  to  the  resulting  change  in  base  current  ( ? I B )  at  cons

Calculate the pressure and temperature, A box is divided into two parts of ...

A box is divided into two parts of equal volume via a partition. The box is thermally insulated from the surroundings.  Consider that compartment 1 contains an ideal gas A at P 0 ,

Waves, how to standing waves formed in closed pipes

how to standing waves formed in closed pipes

Explain conductor, Conductor: Conductors are those substances which per...

Conductor: Conductors are those substances which permit electric current to passes easily by them. e.g. Metal, impure, water etc.

Input capacitor of single stage amplifier circuit, Input  Capacitor  C in ...

Input  Capacitor  C in An  ac  signal  is  supplied  to  gate  of  the  FET  through  an electrolytic capacitor known as input capacitor C in . This capacitor allows only ac

State concept of charging by conducting, State concept of Charging by condu...

State concept of Charging by conducting Charging by conducting - transfer of charge among two objects through contact - objects have similar charge

What do you mean by sound absorber, What do you understand by reverberation...

What do you understand by reverberation time an auditorium What do you mean by sound absorber. Give two examples for good absorbers.

Laplace equation, Laplace equation (P. Laplace): For steady-state heat...

Laplace equation (P. Laplace): For steady-state heat conduction in one dimension, the temperature distribution is the resolution to Laplace's equation, that states the second

P-n junction diode:depletion region, When a P-type semiconductor is suitabl...

When a P-type semiconductor is suitably joined to an N-type semiconductor, then resulting arrangement is called P-N junction or P-N junction diode Depletion region : On account

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