This colorful chart illustrates the full electromagnetic spectrum in graphic simplicity from 10 Hz to 10 MHz, from gamma rays to the extremely low frequencies. It also shows the particular phenomena or applications that characterize different portions of the full spectrum. Both wavelength and frequency scales are provided as are eight different diagrams explaining the operation of a spectrophotometer, the transmittance/absorbancy relationship versus concentration, and four types of optical elements. Chart is made of durable, washable plastic. Size: 23″ x 34″.