What is the frequency in hertz of blue light having a wavelength of 425 nm?

##70588xx10^(14)Hz##
Using the equation for the speed of a light wave and knowing its speed in air we get :
##c=flambda##
##thereforef=c/lambda=(3xx10^8m//s)/(425xx10^(-9)m)=70588xx10^(14)Hz##