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Class 11
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Chemistry
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Structure of Atom
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Towards Quantum Mechanical Model of Atom
Towards Quantum Mechanical Model of Atom
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Developments Leading to Quantum Mechanical Model
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Limitations of Bohr's Model
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De Broglie Equation
4 mins
Heisenberg's Uncertainity Principle
10 mins
Numerical on Heisenberg's uncertainity principle
9 mins
Reasons for failure of Bohr model
10 mins
Quick Summary With Stories
De Broglie Equation
2 mins read
Heisenberg's Uncertainty Principle
3 mins read
Bohr's Atomic Model and its Drawback
2 mins read
Important Questions
State Heisenberg's uncertainty principle. Give its mathematical expression.
Hard
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>
Calculate the wavelength of an electron moving with a velocity of
$2.05×10_{7}ms_{−1}$
.
Medium
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>
In an atom, an electron is moving with a speed of
$600m/s$
with an accuracy of
$0.005%$
, certainity with which the position of the electron can be located is:
$(h=6.6×10_{−34}$
kg
$m_{2}s_{−1}$
, mass of electron
$e_{m}=9.1×10_{−31}$
kg)
Hard
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>
Uncertainty in the position of an electron
$(mass=9.1×10_{−31}kg)$
moving with a velocity
$300ms_{−1}$
accurate upon 0.001% will be:
$[h=6.63×10_{−34}J−s]$
Hard
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>
The frequency of radiation emitted when the electron falls from
$n=4$
to
$n=1$
in a hydrogen atom will be (Given : ionisation energy of
$H=2.18×10_{−18}Jatom_{−1}$
and
$h=6.626×10_{−34}J−s$
)
Hard
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>
An electron and a photon each have a wavelength of 1.00 nm. Find
(a) their momenta,
(b)
the energy of the photon, and
(c)
the kinetic energy of electron.
Medium
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>
The wavelength associated with a golf ball weighing 200g and moving at a speed of
$5mh_{−1}$
is of the order:
Medium
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>
The uncertainty in the momentum of an electron is 1.0
$×$
10
$_{−5}$
kg m s
$_{−1}$
. The uncertainty of its position will be:
[h = 6.626
$×$
10
$_{−34}$
kg m
$_{2}$
s
$_{−1}$
]
Medium
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>
A golf ball has a mass of
$40$
g, and a speed of
$45ms_{−1}$
. If the speed can be measured with in accuracy of
$2%$
, calculate the uncertainty in the position.
Medium
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>
If uncertainty in position and momentum are equal then uncertainty in velocity is:
Hard
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>