Because of this there is a one to one relationship between light's wavelength and its frequency. The speed of light is 186,000 miles per second. The higher the frequency of light, the higher its energy. We know from the problems above that higher frequencies mean shorter wavelengths. High frequency light has short wavelengths and high energy.
Radio waves are examples of light with a long wavelength, low frequency, and low energy.
Or, if you know how much the gas cost, you can calculate how much gas was bought. Planck's constant is 6.626 x 10 -34 erg sec.