Final answer:
The main difference between a radio wave and a light wave is both their wavelength and frequency. Radio waves have longer wavelengths and lower frequencies compared to visible light waves, and these attributes define the energy and position in the electromagnetic spectrum.
Step-by-step explanation:
The main difference between a radio wave and a light wave is C) both of these; that is, both wavelength and frequency. Radio waves have longer wavelengths and lower frequencies compared to light waves within the visible spectrum.
The wavelength of a wave is the distance between corresponding points of two consecutive cycles, and frequency is the number of cycles that pass a given point per second. Higher frequency waves have shorter wavelengths and typically more energy, whereas lower frequency waves have longer wavelengths and less energy.
For example, the wavelength and frequency of red light differ from those of violet light; violet light has a higher frequency and a shorter wavelength than red light.
If a type of radiation has a lower frequency than red light, it might be infrared radiation, which falls below the visible spectrum in the electromagnetic scale. In contrast, radiation with a shorter wavelength than that of violet light could be ultraviolet radiation, which lies above the visible spectrum.