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

Effect of field on superconductivity and meissner effect, EFFECT OF FIELD O...

EFFECT OF FIELD ON SUPERCONDUCTIVITY: Critical Magnetic field, H c is the maximum field that can be applied to a superconductor without destroying the superconducting behaviour

Define term echo, Echo: The sound heard after reflection from an obstac...

Echo: The sound heard after reflection from an obstacle is known as echo.

Explain the term- zener breakdown, Explain the term- Zener Breakdown ...

Explain the term- Zener Breakdown Under a very high reverse voltage, depletion region expands and potential barrier increases resulting in a very high electric field (3X10 7

Compute the flux through the coil, Q. A coil of area of cross section 0.5 m...

Q. A coil of area of cross section 0.5 m 2 among 10 turns is in a plane perpendicular to a magnetic field of 0.2 wb / m 2 . Compute the flux through the coil.

Illustrate how do fireworks turn into shapes like hearts, Q. Illustrate how...

Q. Illustrate how do fireworks turn into shapes like hearts as well as stars? Answer:- The fireworks creators have worked several decades to figure these things out. There

Quantum, What is the mass ms of one 294Uus atom, in SI units? Include the e...

What is the mass ms of one 294Uus atom, in SI units? Include the error bars in your answer, using 1 atomic mass unit 1u = (1.66053892 ± 0.00000007) × 10-27 kg.

Experiment of laboratory tweezers, Laboratory tweezers Very serviceable...

Laboratory tweezers Very serviceable tweezers can be made from lengths of flexible strap iron used to place around boxes and creates for shipment. The tweezers shown are abo

Gauss divergence theorem, Using Gauss divergence theorem show that the volu...

Using Gauss divergence theorem show that the volume of a sphere of radius 'r' is 4⁄3 πr 3 .

Magnetic field, how to study the earth''s magnetic field using a tangent ga...

how to study the earth''s magnetic field using a tangent galvanometer?

Physics, Current time base generator

Current time base generator

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