Frequency

[Anieves]

If the wavelength of red light in air is 816 nm, What is it's frequency? If I use the equation F=c/wavelegth -> with c being 3 x 10^8m/s, why can't I get the right answer? I even converted the 816 nm to 8.16 x 10 ^ 11 m. :confused:

[jamesrc]

You need to be more careful with your units:

816 nm = 816 * 10^(-9) m = 8.16 * 10^(-7) m