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WorksheetsEP-U1-Q1
Total questions: 10
Worksheet time: 6mins
Name
Class
Date
1.
What is mean by LASER
a)
Torch
b)
Artificial light
c)
Ordinary light
d)
Medicine
2.
LASER stands for
(a)
3.
Population inversion means
a)
raising more number of atoms in the lower state
b)
raising more number of atoms in the excited state
c)
nothing
4.
Properties of LASER
a)
coherence, high density
b)
monochromatic
c)
highly directional
d)
all the above
5.
One Photon energy E =
(a)
6.
Optical resonator consist of
a)
partial reflecting mirror
b)
fully reflecting mirror
c)
active medium
d)
all the above
7.
Types of pumping method
a)
Optical pumping, electrical discharge method
b)
Inelastic atom atom collision
c)
Direct conversion
d)
all the above
8.
Direct conversion means
(a)
9.
Output wavelength of homo junction semiconductor Laser
a)
8500 Ǻ
b)
8000 Ǻ
c)
7900 Ǻ
d)
8900 Ǻ
10.
Output wavelength of Hetero junction laser
a)
8000 Ǻ
b)
7000 Ǻ
c)
6000 Ǻ
d)
8400 Ǻ
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