Question

In a cathode ray tube if V is the potential difference between the cathode and anode, the speed of the electron when they reach the anode is proportional to A)V B) 1/V C) √V D) 1/ √V​

Answer 1

Answer:

Correct option is C

Explanation:

Here when an electron is accelerated by the potential difference towards the anode then the kinetic energy of electrons is equal to work done by potential on electrons

1/2mv2=eV

v=√2eV / m

v= √v

where e & m are constant

Answer is C.