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

Entropy, How to calculate change in entropy.

How to calculate change in entropy.

Gaia hypothesis, Gaia hypothesis (J. Lovelock, 1969): The idea that as...

Gaia hypothesis (J. Lovelock, 1969): The idea that as a whole Earth should be regarded as a living organism & that biological procedure stabilize the environment.

What is angle of friction?, Angle of friction is the angle between the resu...

Angle of friction is the angle between the resultant vector(resultant vector:-resultant vector of   frictional force and normalforce) and normal force vector.

Explain kirchoff''s voltage law, Kirchoff's Voltage Law determines that th...

Kirchoff's Voltage Law determines that the algebraic sum of the products of currents and resistances in every of the conductors in any closed path in a network plus the algebraic

Frame of reference, At what velocity a clock should move so that it seems s...

At what velocity a clock should move so that it seems slow by one minute in a day.

Determine the force on tire on car, Q. Helpful Henry's car is pushing Flat...

Q. Helpful Henry's car is pushing Flat-tire Fred's car to the car shop. While the cars are accelerating up to 15 miles/hour Helpful Henry needs to push Fred's car with 60 N of for

How x-rays are produced, Question 1. How X-rays are produced? Describe ...

Question 1. How X-rays are produced? Describe the properties of X-Rays? 2. Describe the half wave & full wave Rectifications employed in an X-ray tube? 3. Discuss the med

Angular frequency of the resulting shm, A sphere of mass m and radius r is ...

A sphere of mass m and radius r is on a smooth fixed inclined plane in equilibrium, if now the sphere is displaced by a small distance along the plane , what will be angular freque

Draw a labelled diagram of a moving coil galvanometer, Draw a labelled diag...

Draw a labelled diagram of a moving coil galvanometer. Verify the principle on which it works. Reduce an expression for the torque acting on a rectangular current carrying loop kep

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