Which of the following is not a property of cathode rays?

Who discovered the presence of electric charge on an electron?

The color of the positive column in a gas discharge tube depends on:

Which one of the following is not electromagnetic in nature?

Write information about the negative electric charge emitted from metals when $UV$ light is incident on them or when metals are heated.

$A$ cathode emits $1.8 \times 10^{14}$ electrons per second when heated. When $400 \ V$ is applied to the anode,all the emitted electrons reach the anode. The charge on an electron is $1.6 \times 10^{-19} \ C$. The maximum anode current is ............ $\mu A$.