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Electromagnetic Waves

JEE Main level, single correct, medium

45 of 165

Question 45 of 165

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

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Answer: (B) Statement I is true but Statement II is false

Out of the three types of radiation, UV rays would be having highest frequency. The maximum kinetic energy is

{K}_{\max }=hf-\phi

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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JEE Main 2025 Apr 2 Shift 1 question paper

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JEE Main Physics practice question on Electromagnetic Waves (Electromagnetic Waves and Maxwell's equations), with the answer and a step-by-step solution. Scan a question from your own book or paper to get a whiteboard video.