Anode voltage of a photocell is kept constant. The wavelength λ of the light falling on the cathode is being slowly modified. The variation of plate current I of the photocell will be ?

Question

Anode voltage of a photocell is kept constant. The wavelength λ of the light falling on the cathode is being slowly modified. The variation of plate current I of the photocell will be ? (A) Option 1

(B)

(C)

(D)

Tardigrade Admin · Accepted Answer

As λ is increased, there will be a value of λ above which photoelectrons will cease to come out so photocurrent will become zero. As λ is decreased, the photoelectric current again decreases and other phenomenon as pair production starts dominating. Hence this graph is correct

Q. Anode voltage of a photocell is kept constant. The wavelength $λ$ of the light falling on the cathode is being slowly modified. The variation of plate current $I$ of the photocell will be ?

As $λ$ is increased, there will be a value of $λ$ above which photoelectrons will cease to come out so photocurrent will become zero.
As $λ$ is decreased, the photoelectric current again decreases and other phenomenon as pair production starts dominating. Hence this graph is correct

Q. Anode voltage of a photocell is kept constant. The wavelength λ of the light falling on the cathode is being slowly modified. The variation of plate current I of the photocell will be ?

As λ is increased, there will be a value of λ above which photoelectrons will cease to come out so photocurrent will become zero. As λ is decreased, the photoelectric current again decreases and other phenomenon as pair production starts dominating. Hence this graph is correct

Q. Anode voltage of a photocell is kept constant. The wavelength $λ$ of the light falling on the cathode is being slowly modified. The variation of plate current $I$ of the photocell will be ?

As $λ$ is increased, there will be a value of $λ$ above which photoelectrons will cease to come out so photocurrent will become zero.
As $λ$ is decreased, the photoelectric current again decreases and other phenomenon as pair production starts dominating. Hence this graph is correct