Dual Nature of Radiation · Physics · KCET

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MCQ (Single Correct Answer)

KCET 2023
A 60 W source emits monochromatic light of wavelength 662.5 nm. The number of photons emitted per second is
KCET 2023
In an experiment to study photoelectric effect the observed variation of stopping potential with frequency of incident radiation is as shown in the fi...
KCET 2023
The energy gap of an LED is $$2.4 \mathrm{~eV}$$. When the LED is switched ON, the momentum of the emitted photons is
KCET 2022
The kinetic energy of the photoelectrons increases by $$0.52 \mathrm{~eV}$$ when the wavelength of incident light is changed from $$500 \mathrm{~nm}$$...
KCET 2022
The de-Broglie wavelength of a particle of kinetic energy $$K$$ is $$\lambda$$, the wavelength of the particle, if its kinetic energy $$\frac{K}{4}$$ ...
KCET 2022
In a photo electric experiment, if both the intensity and frequency of the incident light are doubled, then the saturation photoelectric current...
KCET 2021
The work-function of a metal is 1 eV. Light of wavelength $$3000 \mathop A\limits^o$$ is incident on this metal surface. The velocity of emitted photo...
KCET 2021
A proton moving with a momentum $$p_1$$ has a kinetic energy $$1 / 8$$th of its rest mass-energy. Another light photon having energy equal to the kine...
KCET 2021
According to Einstein's photoelectric equation to the graph between kinetic energy of photoelectrons ejected and the frequency of incident radiation i...
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