Question

Among the following, the correct statement about cathode ray discharge tube is:

• A. The electrical discharge can only be observed at high pressure and at low pressure and low voltage
• B. In the absence of external electrical or magnetic field, cathode rays travel in the straight line
• C. The characterstics of cathode rays depend upon the material of electrodes
• D. The characterstics of cathode rays depend upon the gas present in the cathode ray tube

Answer 1

The correct option is B In the absence of external electrical or magnetic field, cathode rays travel in the straight line

In the absence of external electric or magnetic field, cathode rays travel in a straight line in cathode ray tube. But in the presence of the electric field, the cathode rays are deflected towards the positive pole.