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WorksheetsLASER
Total questions: 13
Worksheet time: 7mins
LASER is the acronym for
Light Amplified by Spontaneous Emission of Radiation
Light Amplification by Stimulated Absorption of Radiation
Light Amplification by Stimulated Emission of Radiation
Light Absorption by Stimulated Emission of Radiation
It is a natural process.
Stimulated absorption
Spontaneous emission
Stimulated emission
None
The photon emitted by this process can be moved only in the direction of the incident photon.
Stimulated Emission
Spontaneous Emission
Stimulated Absorption
Coherence
Population inversion means
Number of atoms in excited state are equal to the number of atoms in the ground state.
Number of atoms in excited state are more than the number of atoms in the ground state.
Number of atoms in excited state are less than the number of atoms in the ground state.
No atom in excited state.
The minimum number of levels required for the condition of population inversion is
2
4
5
3
The life time of metastable state is
smaller than the lifetime of excited state
equal to the lifetime of excited state
More than the lifetime of excited state
Zero
LASER action in He-Ne laser is due to
Ne
He
Ne and He both
Natural process
The nature of output radiation in He-Ne laser is
pulse mode
continuous
Both
None
What is the role of Helium in He-Ne laser?
The condition of population inversion is achieved in He.
He is responsible of Laser action.
He atoms excite Ne atoms.
Einstein proved thermodynamically that
The probability of stimulated absorption is equal to the probability of stimulated emission.
The probability of stimulated absorption is equal to the probability of spontaneous emission.
The probability of stimulated emission is equal to the probability of spontaneous emission.
The population inversion can be achieved by exciting the medium with a suitable form of energy. This process is called....
Stimulated absorption
Stimulated emission
Spontaneous emission
Pumping
The pumping mechanism required in He-Ne Laser is
Electric discharge
optical pumping
Direct conversion
Chemical conversion
A source is said to be Monochromatic if
light coming from a source has only one frequency.
light coming from a source has two frequency.
Light coming from a source has multiple frequency.
