In a discharge tube ionization of enclosed gas is produced due to collisions between

Options

A. positive ions and neutral atoms//molecules
B. negative electrons and neutral atoms//molecules
C. photons and neutral atoms//molecules
D. neutral gas atoms//molecules

Answer

B

Explanation

In a discharge tube , after being accelerated through a high potential difference the ions in the gas strike the cathode with huge kinetic energy . This collision liberates electrons from the cathode. These free electrons from the cathode . These free electrons can further liberate ions from gas molecules through collisions. The positive ions are attracted towards the cathode and negatively electrons move towards anode . Thus , ionization of gas results.