The speed of light in air is 2.998 108 m/s.

a. A red laser emits light with a wavelength of 635 nm. What is its frequency? (Report your answer in s-1 and remember to convert nanometers to meters.)

b. A blue laser emits light with a frequency of 6.74 x 1014 s-1. What is its wavelength? (Report your answer in nanometers, converting your answer from meters.)