The anode voltage of a photocell is kept fixe | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(D) According to the photoelectric effect,the energy of a photon is given by $E = \frac{hc}{\lambda}$.As the wavelength $\lambda$ of the incident ligh

Vedclass · Accepted Answer

Vedclass · Answer

(D) According to the photoelectric effect,the energy of a photon is given by $E = \frac{hc}{\lambda}$.As the wavelength $\lambda$ of the incident light increases,the energy of the incident photons decreases.Photoelectric emission occurs only if the energy of the incident photon is greater than or equal to the work function $\phi$ of the metal surface.This implies that there exists a maximum wavelength,known as the threshold wavelength $\lambda_0$,such that for all $\lambda > \lambda_0$,the energy of the photons is insufficient to eject electrons from the cathode.Consequently,the photocurrent $I$ will be zero for all $\lambda > \lambda_0$.As $\lambda$ increases from a small value towards $\lambda_0$,the number of emitted photoelectrons (and thus the current $I$) generally decreases or remains constant depending on the intensity,but it must drop to zero at $\lambda = \lambda_0$.Among the given options,the graph that shows the current decreasing and eventually becoming zero at a specific wavelength is represented by option $(d)$.

Column-$I$	Column-$II$
$A$. Hallwachs $\&$ Lenard	$P$. Transformers
$B$. Franck-Hertz	$Q$. Microwave
$C$. Klystron valve	$R$. Quantization of energy levels
$D$. Nicola Tesla	$S$. Photoelectric effect

The anode voltage of a photocell is kept fixed. The wavelength $\lambda$ of the light falling on the cathode is gradually changed. The plate current $I$ of the photocell varies as follows:

Similar Questions

Photo cells are used for the:

In the Thomson spectrograph experiment,four positive ions $P, Q, R,$ and $S$ are situated on the $Y-X$ curves as shown in the figure.

Match the following columns:

Column-$I$ Column-$II$

$A$. Hallwachs $\&$ Lenard $P$. Transformers

$B$. Franck-Hertz $Q$. Microwave

$C$. Klystron valve $R$. Quantization of energy levels

$D$. Nicola Tesla $S$. Photoelectric effect

The particle nature and wave nature of electromagnetic waves and electrons can be demonstrated by which of the following?

The correct curve between the stopping potential $(V_s)$ and intensity of incident light $(I)$ is

Vedclass Test Series

Exam Paper Generator

Online Exam Module