Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Explain the meaning of Lasers?
Lasers use these discrete energy levels in atoms or molecules to build a large population of atoms at an excited energy level that are ready and willing to jump down from a higher energy level, E2, to a lower, more stable energy level, E1. Each atom or molecule gives up a photon of the same energy. This shift in energy levels can be expressed as: E2 - E1 = DE = h f.
If a small number of photons of energy E are available for absorption, and many atoms wait in the excited state, E2, then stimulated emission can occur where the photons are emitted in the same direction and phase, creating a coherent beam of light of a single frequency. More energy must be used to create the large number of electrons in energy level E2 than can then be emitted as photons of laser light.
In the most common HeNe (helium and neon) laser, electrons are boosted from the He 1s2 ground state to a metastable He 1s2s state at 20.61 eV through electron impacts. A large population of 5s Ne electrons are built up through collisions which then emit 632.8 nm laser light when they relax to the 18.70 eV Ne 3p electron state. Over time, these electrons find their way back to the Ne 2p ground state to start the trip again.
Two particles execute S.H.M of same amplitude and frequency ,along the same straight line from same mean position.They cross one another without collision,when going in opposite di
Explain the laws of solid friction
Ergosphere The region about a rotating black hole, among the event horizon & the static limit, where rotational energy can be extracted through black hole.
A pith ball weighing 3.0 x 10 -2 N carries a charge of -1.0 x 10 -6 C. The pith ball is placed among two large, parallel, metal plates that are divided by 0.050 m. What is
1) Consider 2kg mixture of H 2 and N 2 ideal gases inside a closed piston-cylinder device at 150kPa and 100o C. This mixture has 0.4 mole fraction of H 2 . This mixture undergoes
When a pulse is reflected from a free side, then there is no changing of medium. Crest (C) represents as crest (C) and trough (T) denotes as trough (T), Time changes by zero and
(i)Cathode waves always travel in straight path. (ii) Cathode rays exert mechanical force on the objects they strike. (iii) Cathode rays make fluorescence. (iv)
illustrate the parts and function of motor
moment of inertia theory
THOMSON'S ATOMIC MODEL:- According to Thomson's atomic model positive charge is distributed uniformly over the entire body of the atom while the electrons are embedded in it. S
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd