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

Determine the acceleration of particle, Regard as an electron and a proton ...

Regard as an electron and a proton at an instant in time to be at a separation of 5 cm from each other. Presume the pair to be totally isolated from its surroundings in the vacuum

Deriving a working equation, Hi, i am max a physics student working on a pr...

Hi, i am max a physics student working on a project. Can you help me derive a working equation from faradays equation and ampere equation in rectangular coordinates? I am trying to

Total internal reflection, Total Internal Reflection: When a ray of li...

Total Internal Reflection: When a ray of light passes from denser medium to rare medium and angle of incidence is greater than the critical angle. The incident ray reflects ba

State the forward characteristic of zener diode, Forward Characteristic of ...

Forward Characteristic of Zener diode Connect the circuit demonstrated in fig (a) using the 5.1 V zener diode. For forward characteristic, reverse the connection of zener di

Atomic structure: number of scattered particles, (i)Most of the alpha-parti...

(i)Most of the alpha-particles pass by the foil straight away undeflected. (ii)Some of them are deflected by small angles. (iii)A few alpha-particles (1 in 1000) are deflecte

Introduction and definition of coulomb’s law, Introduction and Definition: ...

Introduction and Definition: The force between two particles was studied by Coulomb in 1785.  He stated that the force of attraction or repulsion between two charged particle

Scalar aand vector quanties, two vectors 40N and 30N act at acute angle 3o ...

two vectors 40N and 30N act at acute angle 3o degrees to each other find the resultant vector using analytical method

Corrugations, is there any Law of Physics acting in a weighted object place...

is there any Law of Physics acting in a weighted object placed in a corrugated paper and the paper can actually support it well thanky you :)

What is the force required to accelerate a mass, What is the force required...

What is the force required to accelerate a mass of one kilogram one meter per second per second? Basically, you have defined the Newton. Force is the vector product of mass

Besides solid, Besides solid, liquid, and gas, what is the fourth form of m...

Besides solid, liquid, and gas, what is the fourth form of matter? Ans: The fourth form of matter is plasma.

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