Question

$\alpha$-rays have ionisation power because they possess:

• A. lesser kinetic energy
• B. higher kinetic energy
• C. lesser penetration power
• D. higher penetration power

Answer 1

The correct option is B higher kinetic energy

$\alpha$-rays have ionisation power because they posses higher kinetic energy.

When an $\alpha$-particles collides with an electron, it imparts enough energy for it get ionised. This is due to very high kinetic energy possessed by an $\alpha$-particle.