In an experiment of photoelectric effect,the | vedclass

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

Question

(D) According to Einstein's photoelectric equation,the stopping potential $V_s$ is given by $eV_s = \frac{hc}{\lambda} - \phi$,where $\phi$ is the wor

Vedclass · Accepted Answer

$V_2 > 2V_1$

Vedclass · Answer

(D) According to Einstein's photoelectric equation,the stopping potential $V_s$ is given by $eV_s = \frac{hc}{\lambda} - \phi$,where $\phi$ is the work function of the metal.For wavelength $\lambda$,the stopping potential is $eV_1 = \frac{hc}{\lambda} - \phi$  --- $(1)$.For wavelength $\frac{\lambda}{2}$,the stopping potential is $eV_2 = \frac{hc}{\lambda/2} - \phi = \frac{2hc}{\lambda} - \phi$ --- $(2)$.From equation $(1)$,we have $\frac{hc}{\lambda} = eV_1 + \phi$.Substituting this into equation $(2)$:$eV_2 = 2(eV_1 + \phi) - \phi$$eV_2 = 2eV_1 + 2\phi - \phi$$eV_2 = 2eV_1 + \phi$Since the work function $\phi > 0$,it follows that $eV_2 > 2eV_1$,which implies $V_2 > 2V_1$.

In an experiment of photoelectric effect,the stopping potential was measured to be $V_{1}$ and $V_{2}$ with incident light of wavelength $\lambda$ and $\frac{\lambda}{2}$ respectively. The relation between $V_{1}$ and $V_{2}$ is:

Similar Questions

Why maximum kinetic energy of a photoelectron cannot be negative?

The work function for a certain metal is $4.2 \; eV$. Will this metal give photoelectric emission for incident radiation of wavelength $330 \; nm$?

In a photoelectric cell,the wavelength of incident light is changed from $4000 \, \mathring{A}$ to $3600 \, \mathring{A}$. The change in stopping potential will be ............. $V$.

When a photon of energy $8 \ eV$ is incident on a metal surface with a threshold frequency of $1.6 \times 10^{15} \ Hz$,the maximum kinetic energy of the emitted photoelectrons is .......... $eV$. (Given: $h = 6.6 \times 10^{-34} \ Js, 1 \ eV = 1.6 \times 10^{-19} \ J$)

Vedclass Test Series

Exam Paper Generator

Online Exam Module