### Speed of Light

The electromagnetic spectrum is the range of all possible
frequencies of electromagnetic radiation, and extends from
?-radiation at around 10^{23} Hz, through x-rays (ca 10^{19} Hz),
ultraviolet light (ca 10^{15} Hz), visible light (ca 10^{14} Hz), infrared
(ca 10^{13} Hz), and microwaves (ca 10^{9} Hz), to radio waves (10^{7} Hz).
The different types of wave are all related by the equation:

velocity (v) = frequency (f) x wavelength (λ)

Thus if we know, or can measure, any two of these quantities, we can calculate the third. In this experiment we will measure the wavelength of microwaves in a microwave oven, and by looking at the specification printed on the back of the oven we will find out the frequency. With these two data we can calculate the speed of the microwaves, which is the speed of light.