Q. Which one among the following is not an electromagnetic wave?
Answer: Cathode Ray
Notes: In physics, electromagnetic radiation (EMR) refers to the waves (or their quanta, photons) of the electromagnetic field, propagating (radiating) through space carrying electromagnetic radiant energy. It includes radio waves, microwaves, infrared, (visible) light, ultraviolet, X-rays, and gamma radiation only.

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📌 Question Number: 59 in Physics GK 15 - Mechanical & Electromagnetic Waves in the above course in App.