Red light has a wavelength of #7.0 times 10^-7# #m#, what is its frequency?

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Answer 1 · 2017-06-07T05:37:41

Frequency and wavelength for any wave is related as,

#lamdanu = v# where #v# is the velocity of the wave.

For light #v = c = 3 * 10^8 ms^(-1)#

Then, for a given wavelength, #lamda = 7 * 10^(-7) m#, the corresponding frequency,

#nu = (3 * 10^8)/(7 * 10^(-7)) s^-1#

#implies nu = 30/7 * 10^(7+7) s^-1#

Which finally gives,

#nu = 4.28 * 10^(14) s^-1#