(A) Waves of range 1nm to 400nm are produced when inner shell electrons in atoms moving from one energy level to a lower level. (B) The waves of range of wavelength greater the 0.1nm is produced when rapid acceleration and deceleration of electrons in aerials takes place. (C) The waves of wavelength range 1nm to 700nm are produced by the vibration of atom and molecules in a substance. (D) The waves of range of wavelength of less than 10−3nm are produced by the radioactive decay of the nucleus. The correct match is given by A→4,B→3,C→2 and D→1