Answer:
[tex]4.6\cdot 10^{14} Hz[/tex]
Explanation:
The frequency of an electromagnetic wave is given by:
[tex]f=\frac{c}{\lambda}[/tex]
where
[tex]c=3.0\cdot 10^8 m/s[/tex] is the speed of light
[tex]\lambda[/tex] is the wavelength
Red light has a wavelength of
[tex]\lambda=6.5\cdot 10^{-7} m[/tex]
So by using the formula above we can calculate its frequency:
[tex]f=\frac{3.0\cdot 10^8 m/s}{6.5\cdot 10^{-7} m}=4.6\cdot 10^{14} Hz[/tex]
