where 'c' is the speed of light in meters per second, the Greek letter lambda λ is the wavelength in meters and the frequency is in cycles per second. Also, the photon energy can be calculated by the formulas:

where 'e' is energy (joules), 'f' is frequency (cycles per second), 'h' is Planck's constant (6.6260695729 x 10-34 Joule*seconds) and wavelength λ is in meters. As always, we have written a calculator to make the work a little easier for you. INPUT Amount >>>>> Now click one of these boxes Wavelength                   Frequency                   Photon Energy         This calculator was extensively rewritten on October, 2011. If you spot any errors, please send an E-Mail to [email protected]. The box below is NOT for input. >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>>

I N S T R U C T I O N S This is what we call an ultra calculator, which means, you have multiple choices for input and output. For this calculator, you choose from 12 different units of input and the output is displayed in eight different units. For example, if you wanted to know the wavelength and photon energy of a 27 megahertz frequency, enter 27 in the "Input Amount" box, click on the MHz button, and you'll have wavelength and energy in 4 units each. Significant Figures >>> For easy readability, the answers are displayed in a "significant figure" format so you will not see answers such as 77.3333333333333333. Numbers larger than 1,000 and smaller than .001 will be displayed in scientific notation and with the same number of significant figures specified. You may change the significant figures displayed by changing the number in the box above. Most browsers, will display the answers properly but there are a few browsers that will show no output whatsoever. If so, enter a zero in the box above. This eliminates all formatting but it is better than seeing no output at all.