Discussion
Which of the following has the least wavelength?
Answer: A
X-rays have the least wavelength among these.
In order of decreasing wavelength the electromagnetic spectrum runs: radio waves, microwaves, infrared, visible light, ultraviolet, X-rays and gamma rays. Radio waves can be metres to kilometres long, microwaves millimetres to centimetres, ultraviolet about 10 to 400 nm, and X-rays roughly 0.01 to 10 nm.
So of the four options X-rays are shortest; ultraviolet is next, and microwaves and radio waves are far longer.
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