Question

1. Give a list of at least five radiations, in the order of their increasing wavelength, which make up the complete electromagnetic spectrum.
2. Name the radiation mentioned by you in part (a) which has the highest penetrating power.

Answer 1

1. The five radiations are:
   1. Infrared waves
   2. Visible light
   3. Ultraviolet
      8 × 10³ – 10¹¹ Hz.
      4 × 10¹⁴ – 8 × 10¹³ Hz.
      10¹⁶ –  4 × 10¹⁴ Hz.
   4. X-rays
   5. Gamma rays
      10¹⁹ to 10¹⁶ Hz. - above 10¹⁹ Hz.
2. γ with the maximum penetration power are gamma rays.