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JEE PHYSICS MCQ: DUAL NATURE OF RADIATION AND MATTER
1
Medium
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Understanding
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Assertion: Every metal has a definite work function, still all photoelectrons do not come out with the same energy if incident radiation is monochromatic.
Reason: Work function is the minimum energy required for the electron in the highest level of the conduction band to get out of the metal. Not all electrons in the metal belong to this level rather they occupy a continuous band of levels.
Reason: Work function is the minimum energy required for the electron in the highest level of the conduction band to get out of the metal. Not all electrons in the metal belong to this level rather they occupy a continuous band of levels.
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Correct option: A
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion
Option A (If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion) is correct because the reason accurately explains why photoelectrons have varying energies despite a definite work function.
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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