Physics Dawn of Modern Physics BUMHS 2024
PMDC Verified Question 11 of 52
Photoelectron emission depends upon the:
A
Intensity of incident light
B
Color of the body
C
Frequency of incident light
D
Shape of the body
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Frequency of incident light
Concept:

The fundamental trigger for the photoelectric effect hinges entirely on quantum energy levels, not macroscopic quantities or shapes.

Formula:

$$ E = hf $$

Solution:

  • An electron will strictly refuse to leave the metal surface unless it is hit by a single photon carrying energy equal to or greater than the metal's work function.


  • Because photon energy is dictated exclusively by frequency (\( f \)), the mere occurrence of emission relies entirely on reaching this specific threshold frequency.


Why other options are incorrect:

Intense low-frequency light will never cause emission. Shape and color of the macroscopic body have absolutely no bearing on atomic-level quantum binding energies.

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