Question

state any three characteristic properties of beta rays

Answer 1

Beta particles are high-energy, high-speed electrons or positrons emitted by certain fission fragments or by certain primordial radioactive nuclei such as potassium-40. The beta particles are a form of ionizingradiation also known as beta rays. The production of beta particles is termedbeta decay.

Answer 2

Properties Of Beta Rays

\beta-particles  has negative charge and its mass is equal to that of an electron.

All \beta-particles  emitted from a substance have big range of velocities anywhere from 0.3c to 0.9c where c is the speed of light. Note that, at high velocities e/m decreases indicating the increase in mass of the particle according to Einstein’s equation m=\dfrac{m_o}{\sqrt{1-\dfrac{v^2}{c^2}}}  

They have low ionizing power so they cover large range.

They can affect photographic plate.

They can produce fluorescence in willemite, barium platinocyanide etc.

They are deflected by magnetic and electric field. Their direction of deflection has proven that they are negatively charged particles.

\beta-particles  can penetrate through thin metal foils and their penetration power is higher that that of \alpha-particles  

The value of e/m for beta rays was proved to be the same as that of cathode rays. The charge on a \beta-particles  was observed to be the same as the charge of an electron. Therefore \beta-particles  are identical with electrons.