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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.
Grounding a Negatively Charged Electroscope While the negatively charged electroscope is touched and its charge becomes grounded or neutralized this is depicted within the anim
A 0.15 kg glider is moving to the right on frictionless horizontal air track with speed of 0.8 m\s. It has a head on collision with 0.3 kg glider that is moving to the left with a
your dog is running around the grass in your backyard.he undergoes successive displacement 3.50 m. on south,8.20 m northeast, and 15.0 m west.what is the resultant displacement?
Draw a picture of a moving source and the waves surrounding it according to what you observed in this experiment. How does the spacing of the wavefronts in front of the source comp
It is the molecular weight of a substance expressed in grams ; the basic unit of amount of substance adopted under the Systeme International d''Unites.
Evaluate the speed of the block A 2.00-kg block is attached to a spring force constant 500N/n. The block is pulled 5.00 cm to the right of the equilibrium and released from rest
A girl throws a 0.1 kilogram ball at a wall. The ball hits the wall perpendicularly with a velocity of 5 meters per second and then bounces straight back with a velocity of 4
a uniform sphere of mass 2kg is kept in a fixed position by two strings AB and CD. AB is horizontal and CD is inclined at 30° to the vertical. calculate the tension in each string.
What is Parallel-Plate Capacitor Parallel-Plate Capacitor: Device used to keep electrical potential energy and charge. It having of two conducting sheets with equal and oppos
FACTORS AFFECTING INDUCED EMF By experiment, the following factors may be noted: • The faster the magnet (or coil) is moved, the greater is the deflection obtained on the meter
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