Question

The wavelength of a greenlight from the traffic signal is Saturday at 5.20x10^-5cm. calculate the frequency

Answer 1

$$ν=\frac{c}{λ}=\frac{2.998\times 10^8ms^{-1}}{5.20\times10^{-7}m}= 5.77\times10^{14} s^{-1}$$