What is the wavelength of visible light emitted at 6.5 × 10^8 MHz?

Speed of light = Freq x wavelength

3 x 10^8 = 6.5 x 10^8 Mhz   x  wavelength     (Mhz = 10^6)

3x 10^8 / 6.5 x 10^14  = 4.62 x 10^-7 m  = 462 x 10^-9 m =   462 nanometers = wavelength