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JAMB Physics 1998 Question 35

Question 35

Electromagnetic Spectrum

Which of the following are true about infra-red radiation?
I. It is invisible
II. It is called heat ray
III. Its frequency is higher than that of blue light.
IV. It travels as a transverse wave.

  1. A.I, II, III and IV
  2. B.I, II and IV only
  3. C.I, III and IV only
  4. D.II, III and IV only
Show the answer and explanation

Answer: B (I, II and IV only)

Explanation

Infra-red is invisible, is known as heat radiation and, like all electromagnetic waves, is transverse. Its frequency is lower than that of visible light, so III is false.