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JEE PHYSICS MCQ: DUAL NATURE OF RADIATION AND MATTER
1
Medium
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Analyzing
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Assertion: In process of photoelectric emission, all emitted electrons do not have same kinetic energy.
Reason: If radiation falling on photosensitive surface of a metal consists of different wavelength then energy acquired by electrons absorbing photons of different wavelengths shall be different.
Reason: If radiation falling on photosensitive surface of a metal consists of different wavelength then energy acquired by electrons absorbing photons of different wavelengths shall be different.
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Correct option: B
Assertion is correct, reason is correct; reason is not a correct explanation for assertion
The correct answer is B because both the assertion and the reason are correct, but the reason is not a correct explanation for the assertion. The assertion is true because emitted electrons have different kinetic energies, and the reason is true because different wavelengths have different energies, but this isn't the only reason for the assertion.
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Photoelectrons are emitted from a metal surface when UV light of wavelength is incident on it. The minimum negative potential required to stop the emission of electrons is . Calculate:
(i) the energy of the incident photons
(ii) the maximum kinetic energy of the photoelectrons emitted. An electron is accelerated by a potential difference of V volt to acquire kinetic energy equal to maximum kinetic energy of ejected photoelectron from a metal of work function 3.2 eV, using a light of wavelength Value of V is Two monochromatic beams and of equal intensity , hit a screen. The number of photons hitting the screen by beam is twice that by beam . Then, what can inference you about their frequencies? A 5 W source emits monochromatic light of wavelength . When placed 0.5 m away, it liberates photoelectrons from a photosensitive metallic surface. When the source is moved to a distance of 1.0m, the number of photoelectrons liberated will be reduced by a factor of
(i) the energy of the incident photons
(ii) the maximum kinetic energy of the photoelectrons emitted. An electron is accelerated by a potential difference of V volt to acquire kinetic energy equal to maximum kinetic energy of ejected photoelectron from a metal of work function 3.2 eV, using a light of wavelength Value of V is Two monochromatic beams and of equal intensity , hit a screen. The number of photons hitting the screen by beam is twice that by beam . Then, what can inference you about their frequencies? A 5 W source emits monochromatic light of wavelength . When placed 0.5 m away, it liberates photoelectrons from a photosensitive metallic surface. When the source is moved to a distance of 1.0m, the number of photoelectrons liberated will be reduced by a factor of