Discussion
The radiations of extremely short wavelength are
Answer: C
The radiations of extremely short wavelength are gamma rays.
Gamma rays sit at the short-wavelength end of the electromagnetic spectrum, with wavelengths below about \(10^{-10}\) m and down to \(10^{-14}\) m. They are emitted by nuclei.
X-rays are next, with longer wavelengths (roughly \(10^{-8}\) to \(10^{-13}\) m), and ultraviolet is longer still. Alpha and beta rays are streams of particles (helium nuclei and electrons), not electromagnetic radiation, so the question of a 'short wavelength radiation' points to gamma rays.
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