What is the frequency of a 670 nm light wave?
4.5 x 106 s-1
2.2 x 106 s-1
2.2 x 1014 s-1
4.5 x 1014 s-1
4.5 x 106 s-1
2.2 x 106 s-1
2.2 x 1014 s-1
4.5 x 1014 s-1
