Answer:
[tex]2.33*10^{15}Hz[/tex]
Explanation:
The relationship between velocity v, frequency f and wavelength for electromagnetic waves is given by;
[tex]v=\lambda f..............(1)[/tex]
Given;
[tex]v=3*10^8m/s\\\lambda=129nm=129*10^{-9}m\\f=?[/tex]
We make substitutions into equation (1) as follows;
[tex]f=\frac{v}{\lambda}\\f=\frac{3*10^8}{129*10^{-9}}[/tex]
