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JAMB Physics 1983 Question 13

Question 13

Electromagnetic Spectrum

The range of wavelengths of the visible spectrum is 400 nm − 700 nm. The wavelength of gamma rays is

  1. A.longer than 700 nm
  2. B.shorter than 700 nm but longer than 400 nm
  3. C.550 nm
  4. D.shorter than 400 nm
  5. E.infinite.
Show the answer and explanation

Answer: D (shorter than 400 nm)

Explanation

Gamma rays are at the high-frequency end of the electromagnetic spectrum, far beyond violet, so their wavelengths are much shorter than 400 nm.