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

What is the luminous flux of a flashlight, What is the luminous flux of a f...

What is the luminous flux of a flashlight that provides an luminance of 145 lx to the surface of water when held 0.50 m above the water?

Determine the working of coupling capacitor, Coupling  Capacitor  (Cc) ...

Coupling  Capacitor  (Cc) It's  an  electrolytic  capacitor  used  to  couple  one  stage  of amplification to the next stage or load. It allows only amplified ac signal to pas

what is thermal equillibrium?, In physics, the phrase thermal equilibrium ...

In physics, the phrase thermal equilibrium is used sometimes in the common parlance of the ordinary language of physical discourse, and sometimes as a specialized technical term in

Statics, derivation of sackur-tetrode formula

derivation of sackur-tetrode formula

Circular motion, what happens to a conical pendulum when the bob splits int...

what happens to a conical pendulum when the bob splits into two parts such that one part remains attached to the string?

Explain vector addition, Vector Addition While we become students of ph...

Vector Addition While we become students of physics and approach the job of adding vector quantities, we soon become aware of the fact in which the addition of two vector quant

Example of ohm law, Example of Ohm Law Now that we know how to draw a c...

Example of Ohm Law Now that we know how to draw a circuit, let's figure out what is happening in a simple one resistor, one battery (voltage source) circuit. Example 1 - H

Determine the length required for the tube heat exchanger, A concentric tub...

A concentric tube heat exchanger is comprised of a thin wall inner tube of 25.4 mm diameter and an outer tube of 47 mm diameter. The heat exchanger is used for cooling lubricating

Kinematic, A sprinter runs 100.0 m. If he travels at constant acceleration ...

A sprinter runs 100.0 m. If he travels at constant acceleration of 1.95 m/s2 for the first 6.00 s, and then at constant velocity for the remaining time, what was his average veloci

Electric potential of a solid object, Which statement concerning the electr...

Which statement concerning the electric potential of a solid object made out of a perfectly conducting medium is most correct? Answer: It is the electric field which is ze

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