1. Electromagnetic Radiation The speed of electromagnetic radiation (speed of light) is constant at 2.998 x 10 m/s – We’ll express it as 3x10 m/s – The symbol for the speed of light is c 8 8

2. Wavelength Wavelength is the distance from crest to crest of a wave – The symbol for wavelength is (lambda)

3. Frequency The frequency of a wave is the number of waves that pass a given point one second The symbol for frequency is v

4. Let’s bring it all together Frequency and wavelength are related through the speed of light The relationship between frequency and wavelength can be expressed in a mathematical relationship is:

6. Calculate the energy of a photon having a wavelength of 8.4 x 10 cm. c = v 3.0 x 10 m/s = 8.4 x 10 cm v __3.0 x 10 m/s = v 8.4 x 10 cm v = 3.6 x 10 -9 8 8 16

7. Calculate the wavelength of a photon having a whose frequency of 4.7 x 10 s. c = v so = c/v =__3.0 x 10 m/s__ 4.7 x 10 cm = 640 m 5 8 5