Saturday, November 14, 2009

What is the frquency of violet light with a wavelength of 408nm?

The wavelenght L = c/f so the frequency f is:


f = c/L = 3*10^8/408*10^-9 = 7.35*10^14 Hz

What is the frquency of violet light with a wavelength of 408nm?
Hi,





By definition, frequency and wavelength are linked to the speed of light by the following formula:





c = Lf





where c is the speed of light, L the wavelength and f the frequency.





Assuming a vacuum, then the speed of light is c = 3x10^8 m/s.





Thus, all you need to do is solve for f by rearranging the equation to be:





f = c/L





In your case, you have:





f = 3x10^8 / 408x10^(-9) ~= 735 294 117 647 058 Hz





This is approximately 7.35 x 10^14 Hz or 735 THz (Tera-Hertz).





Hope this helps.

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