Q.

Which one among the following is not an electromagnetic wave?

A. X-Ray
B. R-Ray
C. Cathode Ray
D. Infrared Ray
Answer» C. Cathode Ray
Explanation: In physics, electromagnetic radiation (EMR) refers to the waves (or their quanta, photons) of the electro-magnetic field, propagating (radiating) through space carrying electromagnetic radiant energy. It includes radio waves, microwaves, infrared, (visible) light, ultraviolet, X-, and gamma radiation.
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