Question

Violet light has a frequency of 7.26 × 1014 Hz and travels at a speed of 3.00 × 108 m/s.

What is the wavelength of violet light, rounded to the nearest nanometer?

Answer 1

The relation between frequency, F, and  wave length, L  of the light is:

F = c / L, where c is the speed of light

Then, L = c / F = 3.00 x 10^8 m/s / 7.26 x 10^14 s^-1 = 0.413 x 10^ -6 m = 4.13 x 10 ^-7 m