Physics Dawn of Modern Physics PMDC 2020
PMDC Verified Question 42 of 52
Which photon carries the most energy?
A
Blue
B
Red
C
Violet
D
Green
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Violet
Concept:

Within the visible light spectrum, photon energy is dictated by frequency and wavelength.

Formula:

$$ E = \frac{hc}{\lambda} $$

Solution:

  • The visible spectrum colors span from Red (longest wavelength, lowest frequency) to Violet (shortest wavelength, highest frequency).


  • Since Energy \( E \) is inversely proportional to wavelength \( \lambda \), the shortest wavelength carries the most energy.


  • Violet sits at approximately 380-450 nm, giving it the highest energy per photon.


Why other options are incorrect:

Red light has the longest wavelength and thus the least energy. Blue and Green sit in the middle of the spectrum.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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