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#1 Class 12 Physics Dual Nature of Radiation and Matter 2021 Short 3M CBSE
Define threshold frequency, work function, and stopping potential with reference to photoelectric effect.
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#2 Class 12 Physics Dual Nature of Radiation and Matter 2010 Short 1M CBSE
Why does thermionic emission take place only from a metal surface?
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#3 Class 12 Physics Dual Nature of Radiation and Matter 2019 Short 1M CBSE
What is a de-Broglie wave? Write an expression for its wavelength.
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#4 Class 12 Physics Dual Nature of Radiation and Matter 2018 Short 1M CBSE
State de-Broglie hypothesis.
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#5 Class 12 Physics Dual Nature of Radiation and Matter 2023 Long 1M CBSE
Assertion (A): The photoelectrons produced by a monochromatic light beam incident on a metal surface have a spread in their kinetic energies. Reason (R): The energy of electrons emitted from inside the metal surface i...
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#6 Class 12 Physics Dual Nature of Radiation and Matter 2021 Mcq 1M CBSE
The work function for a metal surface is 4.14 eV. The threshold wavelength for this metal surface is
A. 4125 Å
B. 2062.5 Å
C. 3000 Å
D. 6000 Å
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#7 Class 12 Physics Dual Nature of Radiation and Matter 2022 Long 1M CBSE
Assertion (A): For radiation of frequency greater than threshold frequency, photoelectric current is proportional to the intensity of radiation. Reason (R): Greater the number of energy quanta available, greater the n...
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#8 Class 12 Physics Dual Nature of Radiation and Matter 2023 Long 1M CBSE
Assertion (A): de-Broglie wavelength of a freely falling body keeps decreasing with time. Reason (R): The momentum of a freely falling body increases with time.
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#9 Class 12 Physics Dual Nature of Radiation and Matter 2022 Long 1M CBSE
Assertion (A): Photoelectrons produced by a monochromatic light beam incident on a metal surface have a spread in their kinetic energies. Reason (R): The work function of the metal varies as a function of depth from t...
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#10 Class 12 Physics Dual Nature of Radiation and Matter 2019 Mcq 1M CBSE
When ultraviolet rays are incident on a metal plate, photoelectric effect does not occur. It occurs by incidence of
A. X-rays
B. radio waves
C. infrared rays
D. greenhouse effect
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#11 Class 12 Physics Dual Nature of Radiation and Matter 2016 Mcq 1M CBSE
If the intensity of light falling on a metal is increased (frequency above threshold), then
A. KE of photoelectrons increases
B. photoelectric current increases
C. KE of photoelectrons decreases
D. photoelectric current remains constant
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#12 Class 12 Physics Dual Nature of Radiation and Matter 2015 Mcq 1M CBSE
In the photoelectric effect, the number of electrons ejected per second is proportional to
A. intensity of light
B. wavelength of light
C. frequency of light
D. work function of the metal
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#13 Class 12 Physics Dual Nature of Radiation and Matter 2021 Short 2M CBSE
If the kinetic energy of an electron doubles, by what factor does its de-Broglie wavelength change?
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#14 Class 12 Physics Dual Nature of Radiation and Matter 2020 Short 1M CBSE
Write the expression for the mass of a photon of frequency $\nu$.
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#15 Class 12 Physics Dual Nature of Radiation and Matter 2021 Mcq 1M CBSE
The de-Broglie wavelength $\lambda$ depends upon mass $m$ and kinetic energy $E$ as
A. $\lambda \propto (mE)^{1/2}$
B. $\lambda \propto m^{1/2} E^{1/2}$
C. $\lambda \propto m^{-1/2} E^{-1/2}$
D. $\lambda \propto m^{-1/2} E^{1/2}$
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#16 Class 12 Physics Dual Nature of Radiation and Matter 2019 Mcq 1M CBSE
If a photon has velocity $c$ and frequency $\nu$, which of the following represents its wavelength?
A. $h\nu/c^2$
B. $h\nu$
C. $hc/E$
D. $h\nu/c$
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#17 Class 12 Physics Dual Nature of Radiation and Matter 2020 Short 2M CBSE
An electron of mass $m$ and charge $e$ is accelerated from rest through a potential difference $V$ in vacuum. Find its final velocity.
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#18 Class 12 Physics Dual Nature of Radiation and Matter 2017 Mcq 1M CBSE
Which one of the following is chargeless?
A. Alpha particle
B. Beta particle
C. Photon
D. Proton
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#19 Class 12 Physics Dual Nature of Radiation and Matter 2018 Mcq 1M CBSE
The value of 1 MeV is
A. $1.6 \times 10^{-13}$ J
B. $1.6 \times 10^{-19}$ J
C. $1.6 \times 10^{-16}$ J
D. $1.6 \times 10^{-15}$ J
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#20 Class 12 Physics Dual Nature of Radiation and Matter 2019 Mcq 1M CBSE
The energy of emitted photoelectrons depends upon
A. intensity of light
B. wavelength of light
C. work function of metal
D. none of these
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