# What is the frequency of light with a wavelength of 4.257 x 10–7 m.

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Wavelength and frequency are related by speed of light (in vacuum) as:

`lambdanu = c`

i.e., product of wavelength and frequency is equal to speed of light in vacuum.

Using the given value of wavelength (4.257 x10^-7 m) and known value of speed of light (3 x 10^8 m/s), we can calculate the frequency as:

`nu = c/lambda = (3xx10^8)/(4.257xx10^-7)`

`= 7.047 xx 10^14 hz`

hope this helps.