Physics Alternating Current PMC 2021
PMDC Verified Question 84 of 127

Which of the following types of radiation is an electromagnetic wave and therefore requires NO material medium to propagate?
A
Alpha rays
B
Beta rays
C
Gamma rays
D
All of these
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:

Electromagnetic waves consist of self-propagating electric and magnetic fields, allowing them to travel through a vacuum without a supporting physical medium.

Solution:

  • Gamma rays are high-energy photons located at the short-wavelength end of the electromagnetic spectrum. Because they are electromagnetic waves, they require no physical medium to propagate.


  • Alpha rays (helium nuclei) and Beta rays (high-speed electrons or positrons) are streams of physical particles with mass and charge. They are matter streams, not electromagnetic waves.


Why other options are incorrect:

  • Alpha and Beta rays are matter waves/streams that carry mass, so they are not electromagnetic waves and do not propagate in the same manner.

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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