Cathode rays are....

Cathode rays are similar to visible light rays in that

Cathode rays travelling from east to west enter into a region of an electric field directed towards north to south in the plane of the paper. The deflection of cathode rays is towards:

If the thermionic current density is $J$ and emitter temperature is $T$,then the curve between $\frac{J}{T^2}$ and $\frac{1}{T}$ will be

Three particles having their charges in the ratio of $1 : 3 : 5$ produce the same spot on the screen in Thomson's experiment. Their masses are in the ratio of

The mass of the electron varies with