Use the answer space provided to arrange the letters for the following electromagnetic radiation sources in
order of increasing frequency.
a. A red traffic light at 700 nm.
b. The frequency for WZLX, transmitting FM radio waves at 100.7 MHz on the radio dial.
c. Ultraviolet light at 345 nm that is blocked by “Sun Block” to prevent your skin from burning from
exposure to the sun.
d. A green LED light with a wavelength of 555 nm.
e. An infrared heat lamp emitting at a frequency of 3 × 1013 Hz.
Answer: ________ < ________ < ________ < ________ < ________
Well the speed of light is about 3*10*8 m/s
wavelength = speed / frquency
so frequency = speed / wavelength
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700 *10^-9 meters
f = 3 * 10^8 / 700*10^-9 = .0043* 10^17 = 4.3*10^14 Hz
100.7 M Hz = 1.01 * 10^8 Hz
345 nm = 345 * 10^-9 m
f = 3 * 10^8 / 345*10^-9 = 8*10^13 Hz
etc