- Exam
- JEE Main
- Year
- 2023
- Date
- 13 April
- Shift
- Evening Shift
- Subject
- Physics
- Chapter
- Electromagnetic Waves
JEE Main 2023 · 13 April · Evening Shift · Physics · Electromagnetic Waves
Given below are two statements: Statement I : Out of microwaves,...
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
Options
- AStatement I is false but Statement II is true
- BStatement I is true but Statement II is false
- CBoth Statement I and Statement II are true
- 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 = hf - 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.