Question

Sometimes ionization occurs in a medium without direct collision of ? and

? particles. How?

Answer 1

Sol: Sometimes ionization occurs in a medium without direct collision of ? and ? particles due to following reasion:

1). High energetic electromagnetic radiation like X-ray and gamma radiation do have characteristics of particles (photons) that produce ionization in the medium.

2). Delta rays i.e. energetic electrons that produce secondary ionization, when a charged particle such as alpha particle travels through a medium ionization accurs with the ejection of electrons. Some time these electrons are very energetic and they travel through medium and produce secondary ionization.