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Which of the following electromagnetic radiations has the least wavelength?

1. gamma rays
2. infra-red
3. ultraviolet
4. X-rays

Correct answer: gamma rays

Solution

Gamma rays have the least wavelength among the given options, as the electromagnetic spectrum is ordered from longest to shortest wavelength: radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.

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