Microwaves (I MHz=I million cycles per second) (Speed of electromagnetic waves=3X 100 cm./sec.or 186,300 mi./see.) Electronic lonization excitation Nonionization Power Cosmic Gamma X ray Ultraviolet Infrared Broadcast transmission Visibie light 34 electron volts will eject an 0530 electron from B an atom Heating effect 3800A 7600A lepends on (1A=108cm.) polar molecules Fig.2.1.The electromagnetic specirum showing the positions of ordinary light and microwares