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Chapter 20 - Atomic Spectra - 4
1.
Expression for the radius of nth orbit of hydrogen atom is given by:
a) r
n
=n
2
h
2
/4
p
K
2
me
b) r
n
=n
2
h
2
/4
p
2
Kme
2
c) r
n
=n
2
h
2
/4
p
2
K
2
m
2
e
d) r
n
=n
2
h
2
/4
p
2
K
2
me
2.
The quantized radius of 1
st
Bohr orbit of a hydrogen atom is:
a) 0.53
m
m
b) 0.53nm
c) 0.053m
d) 0.053mm
3.
Electromagnetic rays which lies above the X-rays region are called:
a) None of above
b) Ultraviolet radiation
c) Infrared radiation
d) Gamma rays
4.
One or more electrons are completely removed from an atom then atom is said to be:
a) Excited
b) Polarized
c) Ionized
d) Stabilized
5.
The magnitude of ionization potential for H
2
is:
a) 13ev
b) -3.40ev
c) -13.6ev
d) -1.51ev
6.
If E
o
represents the ground state then the Rydberg’s constant R can be expressed
a) R=Eo/hc
b) R=EoC/h
c) R=hc/Eo
d) R=hf/Eo
7.
X-Rays diffraction reveals that they are:
a) Wave type
b) All of above
c) Wave particle type
d) Particle type
8.
Laser can be made from certain;
a) Gases
b) Liquids
c) All of the above
d) Solids
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