Question

21. When an inert gas is filled in place of vacuum in
a photocell, then photoelectric current
(1) Increases (2) Decreases
3) Remains constant (4) Becomes zero​

Answer 1

Answer:

increases

Explanation:

when an inert gas is placed in vacuum the pressure from the cathode causes collision and ionization of gas takes place thereby current increases

Answer 2

When an inert gas is filled in place of vacuum in a photocell, then the photoelectric current :

(1) Increases

• The photoelectric current increases in the presence of inert gas because the photoelectrons emitted by cathode ionize the gas by collision.

• Now the current is produced due to the electrons and also due to the ionized atoms.

• Thus, this results in increased current inside a photocell.