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Class 12
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Physics
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Dual Nature of Radiation and Matter
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Einstein's Photoelectric Equation : Energy Quantum of Radiation
Einstein's Photoelectric Equation : Energy Quantum of Radiation
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Photo Electric Effect of Light and Wave Theory of Light
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Einstein's Photoelectric Equation
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Particle Nature of Light
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Einstein's Photoelectric Equation
13 mins
Problems on Einstein's Photoelectric Equation - I
9 mins
Problems on Einstein's Photoelectric Equation - II
6 mins
Quick Summary With Stories
Photoelectric Effect - III
3 mins
Einstein’s Photoelectric Equation.
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The Light Is Having Particle Nature As Well As Wave Nature(dual nature of light )
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Particle Nature of Light - Problem L1
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Important Questions
When the light of frequency
$2v_{0}$
(where
$v_{0}$
is threshold frequency), is incident on a metal plate, the maximum velocity of electrons emitted is
$v_{1}$
. When the frequency of the incident radiation is increased to
$5v_{0}$
, the maximum velocity of electrons emitted from the same plate is
$v_{2}$
. The ratio of
$v_{1}$
to
$v_{2}$
is?
Medium
NEET
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>
Derive Einstein's photoelectric equation.
Medium
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Write Einstein's photoelectric equation and mention which important features in photoelectric effect can be explained with the help of this equation.
The maximum kinetic energy of the photoelectrons gets doubled when the wavelength of light incident on the surface changes from
$_{′}λ_{1}$
to
$_{′}λ_{2}$
. Derive the expressions for the threshold wavelength
$_{′}λ_{0}$
and work function for the metal surface
Medium
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Draw a plot showing the variation of photoelectric current with collector plate potential foe two different frequencies,
$v_{1}>v_{2}$
, of incident radiation having the same intensity. In which case will the stopping potential be higher ? Justify your answer.
Medium
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In the stydy of a photoelectric effect the graph between the stopping potential V and frequency v of the incident radiation on two different metals P and Q is shown below:
(i) Which one of the two metals has higher threshold frequency?
(ii) Determine the work function of the metal which has greater value.
(iii) Find the maximum kinetic energy of electron emitted by light of frequency
$8×10_{14}Hz$
for this metal.
Medium
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Obtains Bohr's quantisation condition for angular momentum of electron orbiting in
$n_{th}$
hydrogen atom on the basis of the wave picture of an electron using de Broglie hypothesis.
Medium
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>
Plot a graph showing the variation of stopping potential with the frequency of incident radiation for two different photosensitive materials having work functions
$W_{1}$
and
$W_{2}(W_{1}>W_{2}).$
On
what factors does the (i) slope and (ii) intercept of the line depend?
Hard
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Light of wave length 5000 Angstrom falls on a sensitive plate with photoelectric work function of 1.9 eV. The maximum kinetic energy of the photo electron emitted will be..
Medium
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In a photoemissive cell with exciting wavelength
$λ$
, the fastest electron has speed
$v$
. If the exciting wavelength is changed by
$3λ/4$
, the speed of the fastest emitted electron will be :
Medium
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>
The graph between the stopping potential
$V_{0}$
and frequency
$v$
for two different metal plates P and Q are shown in the figure. Which of the metals has greater threshold wavelength and work function?
Medium
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>