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JEE Main202313 Apr 2023Evening ShiftPhysicsElectromagnetic WavesActual

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

  1. AStatement I is false but Statement II is true
  2. BStatement I is true but Statement II is false
  3. CBoth Statement I and Statement II are true
  4. DBoth Statement I and Statement II are false

Correct answer

B. Statement I is true but Statement II is false

Step-by-step solution

Out of the three types of radiation, UV rays would be having highest frequency. The maximum kinetic energy is K max = h f - ϕ Clearly, the maximum kinetic energy is dependant on the frequency of the incident radiation and the work function of the metal. From the given spectrums UV rays have the highest energy. Hence, this option is the correct one.

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