Watch this video to see demonstrations of how to use the equation **C=λf** to solve a problem.

(Note: In this video the instructor uses “v” to represent frequency instead of “f.” It does not change the outcome of the solution.)

Now try out these practice problems. Work the following problems on a scratch sheet of paper. If you get stuck, go back and watch the video tutorials again. Once you think you have the correct answer, click on the answer box to see the solution.

- A certain violet light has a wavelength of 4.13 x 10
^{-7}m. What is the frequency of the light? Interactive popup. Assistance may be required. - Calculate the wavelength of the yellow light emitted by a sodium lamp if the frequency of the radiation is 5.10 x 10
^{14}s^{-1}? Interactive popup. Assistance may be required.