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WBCS Preliminary Examination 2016 — General Studies · Question 106 of 200

Q106
General SciencePhysics
X-rays are
  1. a.electromagnetic radiations of very short wavelength.
  2. b.beams of electrons.
  3. c.electromagnetic radiations of very long wavelength.
  4. d.visible to the naked eye.

Answer: (A) electromagnetic radiations of very short wavelength.

X-rays are electromagnetic radiation with wavelengths in the range of 0.01 to 10 nanometres — much shorter than visible light. They were discovered by Wilhelm Röntgen in 1895. Their short wavelength gives them high energy and penetrating power.

Q105 Whole paperQ107