Question

Which of the following is the correct condition required for the formation of cathode rays in the discharge tube experiment?

• A. 1 atmospheric pressure and high voltage
• B. ${10}^{–2}$ atmospheric pressure and low voltage
• C. ${10}^{–2}$ atmospheric pressure and high voltage
• D. 5 atmospheric pressure and low voltage

Answer 1

The correct option is C ${10}^{–2}$ atmospheric pressure and high voltage

High voltage and very low pressure (about ${10}^{-2}$ atmospheric pressure) should be maintained in the discharge tube experiment for the production of cathode rays.
Hence, the correct answer is option (c).