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Atomic Spectra - 3
1.
The separation of ordinary white light into its component colours by the use of prism or grating is called:
a) transmission
b) Spectroscopy
c) Diffraction
d) Disperssion
2.
The Spectrum of visible sun light ranges from
a) 400nm to 700nm
b) 650nm to 430nm
c) 600nm to 900nm
d) All of the above
3.
The spectrum in which different colours are not diffused into each other and are separated by dark spaces is usually known as:
a) Black spectrum
b) Continuous spectrum
c) Band spectrum
d) Line spectrum
4.
Balmer empirical formula explains the electromagnetic radiations of any excited atom in terms of their:
a) Frequency
b) Wavelength
c) Mass
d) Momentum
5.
P fund series is give by the formula:
a) 1/
l
=R
H
[1/4
2
–1/n
2
]
b) 1/
l
=R
H
[1/5
2
–1/n
2
]
c) 1/
l
=R
H
[1/1
2
–1/n
2
]
d) 1/
l
=R
H
[1/3
2
–1/n
2
]
6.
Electrons continuously radiate energy during their motion was given by:
a) J.J Thomson
b) Neil Bohr
c) Rutherford
d) None of above
7.
Bohr angular momentum of an electron in one of its allowed orbit is given by:
a) Mv= nh/2
p
b) mv= h/n
p
c) mv= 2
p
/nh
d) mvr= nh/2
p
8.
Expression for the radius of nth orbit of hydrogen atom is given by:
a) r
n
=n
2
h
2
/4
p
2
K
2
me
b) r
n
=n
2
h
2
/4
p
K
2
me
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
Kme
2
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