Question

Cathode rays obtained from different gases have same mass and charge. Explain.

Answer 1

• Cathode rays are nothing but beams of electrons.
• To produce cathode rays from a gas, take the gas inside a container.
• Pass cathode rays (negatively charged) from a cathode through the container.
• The rays will strike and ionise the gas taken inside the container.
• The electrons that were ejected from the gas ionisation will move to the anode.
• Thus these rays are nothing but electrons. So irrespective of the nature of the gas taken we get electrons.
• All electrons have the same charge and equal mass.
• Charge=1.6×10^-19 C
• mass=9.1×10^-31 Kg