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Quiz 3
Solution
Q.1.
The lifetime of electrons are more in
Pump state
Excited state
Meta stable state
Ground state
Q.2.
Laser is a coherent source of light. This means all the light waves....
are out of phase
are in phase
have different directions
have same direction
Q.3.
In Ruby laser optical pumping is done through
external green light
electric discharge
by heating the system
external red light
Q.4.
If optical resonator is not formed
No output in laser would be there
Output would be there but would stop very soon
Intensity can't grow
No laser would be produced at all
Q.5.
According to Einstein at equilibrium
Rate of absorption of radiation is equal to rate of stimulated emission
Rate of spontaneous emission is equal to rate of stimulated emission
Rate of absorption of radiation is equal to rate of spontaneous emission
Rate of stimulated emission is constant
Q.6.
Population inversion for Lasing action means
More electrons in ground state than excited state
More electrons in any excited state than ground state
More electrons in 1st excited than ground state
More electrons in metastable state than ground state
Q.7.
Life time of electron in ground state of an atom in seconds
0
equal to half life period
1
Infinite
Q.8.
What is the energy of Photon?
E = hνE\ =\ h\nuE = hν
E = mc2E\ =\ mc^2E = mc2
E = h2ν2E\ =\ h^2\nu^2E = h2ν2
E =hmvE\ =\frac{h}{mv}E =mvh
Q.9.
According to J. Maxwell theory Light is an
Electromagnetic Wave
Acoustic Wave
Tidal Wave
Longitudinal Wave
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