Dual Nature of Radiation · Physics · COMEDK

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MCQ (Single Correct Answer)

COMEDK 2023 Morning Shift
When a certain metal surface is illuminated with light of frequency $$\nu$$, the stopping potential for photoelectric current is $$V_0$$. When the sam...
COMEDK 2023 Morning Shift
Let $$K_1$$ be the maximum kinetic energy of photoelectrons emitted by light of wavelength $$\lambda_1$$ and $$K_2$$ corresponding to wavelength $$\la...
COMEDK 2023 Evening Shift
In the photoelectric experiment, the frequency of the incident radiation is doubled. What will be its effect on the photoelectric current?
COMEDK 2022
Ultraviolet light of wavelength 99 mm falls on a metal plate of work function 1.0 eV. If the mass of the electron is 9.1 $$\times$$ 10$$^{-31}$$ kg, t...
COMEDK 2022
If K$$_1$$ and K$$_2$$ are maximum kinetic energies of photoelectrons emitted when lights of wavelengths $$\lambda_1$$ and $$\lambda_2$$, respectively...
COMEDK 2021
The velocity of the proton is one-fourth the velocity of the electron. What is the ratio of the de-Broglie wavelength of an electron to that of a prot...
COMEDK 2021
From the figure describing photoelectric effect, we may infer correctly that ...
COMEDK 2020
Light of frequency 1015 Hz falls on a metal surface of work function 2.5 eV. The stopping potential of photoelectrons (in V) is
COMEDK 2020
A proton accelerated through a potential V has de-Broglie wavelength $$\lambda$$. Then, the de-Broglie wavelength of an $$\alpha$$-particle, when acce...
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