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## Homework Statement

The human eye is sensitive to light of wavelengths from about 400 to 700nm. What range of frequencies does this range correspond to? Take the speed of light to be 3.00 x 10^8 m/s.

## Homework Equations

f=v/lambda

## The Attempt at a Solution

3.00 x 10^8 / 400,000m = 750 HZ

I didn't bother to find the frequency for 700nm because i know 750hz is wrong... the answer for frequency of 400nm is supposed to be 4.3x10

^{14}, but i have no idea why.

thanks for the help!