What is wrong about anode rays?

Options

A. Their e/m ratio is constant
B. They are deflected by electrical and magnetic field
C. They are produced by ionisation of molecules of the residual gas
D. Their e/m ratio depends on nature of residual

Answer

A

Explanation

Anode rays consist of positive ions formed by ionisation of gas molecules. The charge (e) on positive ion depends upon the number of electrons knocked out from gas molecules. Hence e/m will not be constant.