Question

How can the rate of emission of electrons in a cathode ray tube be increased ?

• A. By increasing the filament current
• B. By decreasing the filament current
• C. Can't be increased
• D. None of the above

Answer 1

The correct option is A By increasing the filament current

By increasing the filament current filament temperature increases, which transfer the heat to cathode. By this, the rate of electronic emission can be increased.