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JEE Main · 2023 · 13 Apr 2023 · Shift 2 · Modern Physics

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Given below are two statements:

Statement I : Out of microwaves, infrared rays and ultraviolet rays, ultraviolet rays are the most effective for the emission of electrons from a metallic surface.

Statement II : Above the threshold frequency, the maximum kinetic energy of photoelectrons is inversely proportional to the frequency of the incident light.

In the light of above statements, choose the correct answer from the options given below
  1. (A)Statement I is true but Statement II is false✓ Correct
  2. (B)Both Statement I and Statement II are true
  3. (C)Statement I is false but Statement II is true
  4. (D)Both Statement I and Statement II are false

Answer: (A)

Solution

UV rays have the highest frequency among the three types mentioned, making them most effective for photoelectric emission (Statement I is true). According to Einstein's photoelectric equation, , the maximum kinetic energy is directly proportional to frequency, not inversely proportional (Statement II is false).

JEE Main · 2023 · 13 Apr 2023 · Shift 2 · Single correct option

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