what is the frequency of light having a wavelength of 691 nm? what is the wavelength(in nm) of radiation having a frequency of 4.29*10^9 Hz? ( the radiation is in the microwave region)

what is the frequency of light having a wavelength of 691 nm? what is the wavelength(in nm) of radiation having a frequency of 4.29*10^9 Hz? ( the radiation is in the microwave region)

a) frequency of light?
…..*10^… Hz

b) Wavelength of radiation?

…..*10^…. nm

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