Video Transcript
Which of the following types of waves is not a part of the electromagnetic spectrum? (A) Infrared waves, (B) P-waves, (C) microwaves, (D) gamma rays, (E) X-rays.
We need to determine which of these answer choices is not like the others, and we can start by sketching out a diagram of the electromagnetic spectrum. And remember, Although the spectrum is a continuous range, it’s helpful to divide it up into different sections each one itself arranged based on properties such as energy and wavelength.
We generally designate seven different regions. And from highest to lowest energy, they’re known as gamma rays, X-rays, ultraviolet rays, visible light, infrared waves, microwaves, and radio waves. Now notice that answer choices (A), (C), (D), and (E) can all be found as parts of the spectrum. Answer choice (B) P-waves is the odd one out. This is because P-waves or primary seismic waves carry energy through Earth’s interior as a result of events such as earthquakes.
And besides the fact that P-waves are waves, they have very little in common with electromagnetic waves. For instance, P-waves are longitudinal, whereas electromagnetic waves are transverse. Further, P-waves travel by means of the Earth, but electromagnetic waves don’t require a physical medium to travel through.
Therefore, answer choice (B) is correct. P-waves is a type of wave, but it is not a part of the electromagnetic spectrum.
