So here we're going to use our memory tool to help us with this example question. It says which kind of electromagnetic radiation contains the greatest amount of energy per atom. Here, remember, as we move from left to right, we're going to say that our frequency increases, so μ is increasing. And this is important to know because remember, energy and frequency are directly related, so the greatest amount of energy would correlate to the highest frequency.
So who's most to the right here? If we look, microwave is for Martians, so that's out. X-ray is over here. And the only thing higher than that is gamma rays. And we don't have gamma rays listed as an option. So here our answer would have to be choice B.
Remember, large rude Martians invented very unusual X-ray guns. Stands for long radio waves, radio waves. Here we have microwaves. Here we have infrared, the visual light spectrum. We have UV light, X-ray and then gamma ray.