Which of the following is an electromagnetic wave?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Light waves
An electromagnetic wave is made of electric and magnetic fields that vibrate together and travel even through vacuum.
Option (1) Sound waves — Incorrect. Sound is a mechanical wave. It needs a medium such as air and cannot cross vacuum.
Option (2) Matter waves — Incorrect. Matter waves are the de Broglie waves linked with moving particles such as electrons. They are not vibrating electric and magnetic fields.
Option (3) Light waves — Correct. Visible light is the part of the electromagnetic spectrum that our eyes can detect.
NCERT (2026-27):
Introduction – “This led to the remarkable conclusion that light is an electromagnetic wave.”