Which of the following electromagnetic waves has the longest wavelength?
Radio waves
Infrared radiations
x rays
visible rays
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Solution
The correct option is A
Radio waves
The electromagnetic spectrum contains waves of all lengths, from long radio waves larger than buildings to short gamma rays smaller than an atom's nucleus.
The radio waves, microwaves, infrared, optical, ultraviolet, X, and gamma rays are all part of the electromagnetic spectrum, and vary from longest wavelength to shortest.
Therefore, radio waves have the longest wavelength. Hence, option A is correct.
