Physics Dawn of Modern Physics MDCAT 2015
PMDC Verified Question 49 of 52
Which one of the following has the largest energy content?
A
Infrared rays
B
Ultra violet radiations
C
\( \gamma \)-rays
D
X-rays
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: \( \gamma \)-rays
Concept:

The energy of an electromagnetic wave is directly proportional to its frequency and inversely proportional to its wavelength.

Formula:

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

Solution:

  • In the electromagnetic spectrum, gamma (\( \gamma \)) rays possess the highest frequency and the shortest wavelength.


  • Therefore, they carry the highest energy per photon compared to the other listed types.


Why other options are incorrect:

Infrared, ultraviolet, and X-rays all have progressively lower frequencies (and longer wavelengths) than gamma rays, meaning their energy content per photon is strictly lower.

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