Question

What is the frequency of light (s-1) that has a wavelength of 1.23×10−6 cm?

Answer 1

Frequency = speed of light / wavelength

Speed of light should be taken as 3 * 10^8 m/s

Be careful with the units..

1 m= 100 cm = 10^-9 nm = 10^ -10 angstrom = 10^ - 12 pm.. However, the most commonly used unit for wavelength of light is nm