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Class 11
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Chemistry
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Structure of Atom
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Development Leading to Bohr's Model of Atom
Development Leading to Bohr's Model of Atom
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Electromagnetic Radiation
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Important Questions
The work function of caesium metal is 2.14 eV. When the light of frequency
6
×
1
0
1
4
H
z
is incident on the metal surface, photoemission of electrons occurs. Calculate:
(a) the maximum kinetic energy of the emitted electrons,
(b)
stopping potential,
(c) the
maximum speed of the emitted photoelectrons?
Medium
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>
Calculate energy of one mole of photons of radiation whose frequency is
5
×
1
0
1
4
.
Hard
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>
Calculate (a) frequency and (b) wave-number of yellow radiation having wavelength
5
8
0
0
A
o
.
Medium
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>
A 100 watt bulb emits monochromatic light of wavelength 400 nm. Calculate the number of photons emitted per second by the bulb.
Hard
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>
The value of Planck's constant is
6
.
6
3
×
1
0
3
4
Js. The speed of light is
3
×
1
0
1
7
nm
s
1
. Which value is closest to the wavelength in nanometer of a quantum of light with a frequency of
6
×
1
0
1
5
s
1
?
Medium
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>
Calculate the mass of a photon with wavelength 3.6
A
0
. Name the principle/equation/concept used. (
1
A
0
=
1
×
1
0
−
1
0
m
, speed of light
=
3
×
1
0
8
m
s
−
1
,
h
=
6
.
6
2
6
×
1
0
−
3
4
J
S
) 03
Medium
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>
A gas absorbs a photon of
3
5
5
n
m
and emits two wavelengths. If one of the emission is at
6
8
0
n
m
, the other is at:
Medium
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>
Calculate the wavelength, frequency and wave number of a light wave whose period is
2
.
0
×
1
0
−
1
0
s
.
Medium
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>
Yellow light emitted from a sodium lamp has a wavelength
(
λ
)
of 580 nm. Calculate the frequency (v) and wavenumber
(
v
ˉ
)
of the yellow light.
Medium
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>
Electromagnetic radiation of wavelength
2
4
2
n
m
is just sufficient to ionise the sodium atom. Calculate the ionisation energy of sodium in
k
J
m
o
l
−
1
.
Medium
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>