Q. Which among the following has highest energy in the Electromagnetic spectrum? Answer:
Gamma rays
Notes: Gamma rays of Electromagnetic spectrum has highest energy. Descending order of energies of different portions of the spectrum: Gamma rays > X rays > Ultraviolet rays > Visible spectrum > Infrared rays > Micro waves > Radio waves. Extra info: Wavelengths of the above portions of the spectrum is inverse to the energies. eg: Gamma wave has shortest wavelength and radio waves have highest wavelength.