The metal which has the highest work function among the following is:

Cathode rays enter into a uniform magnetic field perpendicular to the direction of the field. In the magnetic field,their path will be:

The relation between current and charge is given by $I = A T^2 e^{qV / V_L}$. What is the value of $V_L$?

What is the speed of cathode rays?

When a magnetic field is applied in a direction perpendicular to the direction of cathode rays,then their

$A$ beam of cathode rays is subjected to crossed electric $(E)$ and magnetic fields $(B).$ The fields are adjusted such that the beam is not deflected. The specific charge of the cathode rays is given by (where $V$ is the potential difference between cathode and anode):