Final answer:
Wave A in the electromagnetic spectrum refers to microwaves, which have wavelengths ranging from 1 millimeter to 1 meter. Consequently, radio waves, with much longer wavelengths, have a longer wavelength than microwaves.
Step-by-step explanation:
The question asked is about wave A in the electromagnetic spectrum and whether it has a longer wavelength than a radio wave. According to the provided information about the electromagnetic spectrum, different types of electromagnetic waves vary in wavelength and frequency. Radio waves have very long wavelengths, ranging from over a meter to hundreds of meters, and in some cases, up to several kilometers.
Now, if we're referring to wave A as microwave radiation, which sits between infrared and radio waves in the spectrum, its wavelengths would range from 1 millimeter to 1 meter. Thus, radio waves possess a longer wavelength than microwaves, as microwaves are described to have wavelengths shorter than radio waves but longer than infrared rays.
It is important to remember that within the electromagnetic spectrum, the energy carried by a wave is inversely related to its wavelength: the longer the wavelength, the less energy the wave carries, and the shorter the wavelength, the more energy is present. Consequently, since radio waves have longer wavelengths, they carry less energy compared to waves with shorter wavelengths, like microwaves.