Question

A radioactive source emits three types of radiations. A radiation is has a spectrum of frequency. Which one is it ?

• A. Beta
  
• B. Alpha
• C. Gamma
• D. None of these
  

Answer 1

The correct option is A Beta

$\alpha$ rays are $H{e}_2^4$ particles and $\beta$ rays are $e^{-}$(excited) so both have mass and both are particle waves while $\gamma$ rays don't have mass so these are electromagnetic waves.

The energy distribution between beta particles is not uniform. The particles with high energy with respect to low energy particles are less in amount. So we get energy spectrum or spectrum of frequency in beta rays radiation.

Hence option 'A' is correct.