A microwave oven operates at 2.60 GHz. What is the wavelength of the radiation produced?

Speed of light = freq * wavelength

wavelength = speed of light / freq = (3*10^8 m/sec) / (2.6 * 10^9 / sec) = 1.15 * 10^ (-1) m

1.15 * 10^ (-1) m * (10^9 nm / m) = 1.15 * 10^8 nm