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Which of the following pairs is not part of the electromagnetic spectrum?

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PHYSICS

Which of the following pairs is not part of the electromagnetic spectrum?

  • I. Radio waves
  • II. Beta rays
  • III. Gamma rays
  • IV. Alpha rays

A. I and II

B. III and IV

C. I and III

D. II and IV

QUICK ANSWER…

D

DETAILS…

Please note that there’s an acronym you can memorize and use to remember all the electromagnetic waves, the acronym is:

GXUVIMR, where

G = gamma rays (highest frequency, and lowest wavelength)

X = x-rays

U = ultraviolet rays

V = visible light

I = infrared rays

M = microwaves

R = radio waves (lowest frequency, highest wavelength)

Their wavelength increases while their frequency decreases from top to down. They all travel at the same speed of light.

Let’s now analyze each point:

  • I. Radio waves are electromagnetic waves.
  • II. Beta rays are not electromagnetic waves.
  • III. Gamma rays are electromagnetic waves.
  • IV. Alpha rays are not electromagnetic waves.

Now for the right answer to the above question:

  1. Option A is incorrect. radio waves are part of it.
  2. Option B is incorrect. gamma rays are part of it.
  3. C is incorrect. both are part of it.
  4. D is the correct answer. both are not part of it.

KEY-POINTS…

You may please note these/this:

  • There are seven kind of rays/waves in the electromagnetic spectrum.
  • The correct acronym used to memorize the identity of each ray in the electromagnetic spectrum is GXUVIMR.
  • Beta rays and alpha particles are products of radioactivity, they are not part of the spectrum.

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/ culled from 2020 JAMB-UTME physics past question 39 /

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