Question

# Which of the following are not electromagnetic waves?A. Cosmic raysB. Gamma raysC. β-raysD. X-rays

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Hint: Electromagnetic radiation is a form of energy produced when charged particles move by vibrating magnetic and electric fields. An electromagnetic spectrum is the range of all electromagnetic radiations. To solve this question we check the electromagnetic spectrum, by doing that it would be easy to find the odd one from the options.

We know what electromagnetic radiation and electromagnetic spectrum is. Electromagnetic spectrum consists of, from shortest wavelength to longest wavelength:
Gamma rays-X rays-Ultraviolet rays-Visible light-Infrared-Microwaves-Radio waves
From this it is clear that cosmic rays are not part of the electromagnetic spectrum, and thus they are not electromagnetic radiation.
Cosmic rays are high energy outer space particles that consist mainly of protons. Or we can say that they are subatomic particles that travel at fractions of the speed of light.
Hence, the correct answer is option A and C.

X-ray is a high energy electromagnetic radiation. Its wavelength ranges from $\text{10pm-10nm}$.X-rays are highly used in medical field mainly for checking fractures