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Laser - Questions and Answers

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1. Laser can be used in the
A. fission reaction
B. polarization
C. thermo-nuclear fusion
D. production of white light
Explanation:
2. The life time of atoms in the excited state is normally
A. 10-6 s
B. 10-4 s
C. 10-5 s
D. 10-8 s
Explanation:
3. In a ruby laser, a large number of atoms occupy
A. ground state
B. excited state
C. metastable state
D. normal state
Explanation:
4. In Ruby laser the atoms are excited by
A. ruby rod
B. flash tube
C. silvered mirror
D. semi-transparent mirror
Explanation:
5. Laser light is intense because
A. it has very less number of Photons that in phase
B. it has very less number of Photons that are not in phase
C. it has very large number of Photons that are in phase
D. it has very large number of Photons that are not in phase
Explanation:
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