Physics Alternating Current ETEA 2019
PMDC Verified Question 89 of 127

Which of the following is NOT an electromagnetic wave?
A
Radio waves
B
X-rays
C
Sound waves
D
Light waves
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Sound waves
Concept:

This question distinguishes between electromagnetic waves and mechanical waves.

Solution:

Sound waves are mechanical waves. They consist of pressure fluctuations (compressions and rarefactions) in a physical medium and require a material medium (like air, water, or solids) to travel. They cannot travel through a vacuum.

Radio waves, X-rays, and visible light waves are all electromagnetic waves made of oscillating electric and magnetic fields, so they can travel through a vacuum.

Why other options are incorrect:

  • Radio waves, X-rays, and light waves are all classified as electromagnetic waves because they consist of fluctuating electric and magnetic fields.

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