Answer :

olemakpadu
Velocity = fλ

where f is frequency in Hz, and λ is wavelength in meters.

2.04 * 10⁸ m/s =  5.09 * 10¹⁴  Hz   *  λ 

(2.04 * 10⁸ m/s) / (5.09 * 10¹⁴  Hz ) = λ 

4.007*10⁻⁷  m =  λ 

The wavelength of the yellow light = 4.007*10⁻⁷  m

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