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JEE PHYSICS MCQ: DUAL NATURE OF RADIATION AND MATTER
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Medium
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Understanding
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Assertion: Photoelectric effect is the phenomenon of emission of photon by metal when illuminated by light of suitable frequency.
Reason: An electron beam carries sufficient energy to release photons from the metal.
Reason: An electron beam carries sufficient energy to release photons from the metal.
View answer and explanation
Correct option: D
Both Assertion and Reason are false
Option D is correct because both the assertion and the reason are false. The photoelectric effect involves the emission of electrons, not photons, and is caused by light, not an electron beam.
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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