Answer: c
In the electromagnetic spectrum there are visible and non-visible rays. The visible light region is in the middle of the spectrum. All the radioactive rays are situated on the extreme right of the spectrum and microwaves are located on the left of the spectrum.
The trend followed by the electromagnetic spectrum is that as we move from the left to right on an electromagnetic spectrum the frequency increases and the wavelength of the rays increase. So, the rays on the extreme right have the lowest wavelength.
All the radioactive rays are present on the extreme right of an electromagnetic spectrum out of which Gamma rays are the last then X-rays and then ultraviolet rays.
Hence Gamma rays have the lowest or smallest wavelength.
Option (C), Gamma rays is the correct answe
