PHYSICS- please help! i cant get my last problem

The compound eyes of bees and other insects are highly sensitive to light in the ultraviolet portion of the spectrum, specifically light with wavelengths between 300.0 nm and 400.0 nm. To what frequencies do these wavelengths correspond? (Assume that the speed of light to be 3.00 108 m/s.)

_________ Hz

_________ Hz

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  1. 1E15
    and
    7.5e14

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