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They're just asking for the wavelength of the broadcast's radio waves. Since you know the frequency is 99.5 MHz and you know that radio waves are a type of electromagnetic radiation (so they move at the speed of light), you can just use the equation C = wavelength x frequency and solve for the wavelength. Hope that helps!
Unless he specifies, I don't think it matters if you leave it in meters or nanometers. Typically yes the SI unit is meters, but if the question ever asks to compare it to the line spectrum then its easier to compare it when your answer is in nanometers.
Actually if you want the units to match up you should put it in meters. A joule (the unit for energy) is comprised of (kg x m^2 / s^2) so if you want the units to better match up you should convert nanometers to meters. Just be sure to convert it back to nanometers if it asks you f this answer is in the visible light spectrum.
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