Light of wavelength 4000 mathring A is incid | vedclass

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

Question

(B) The work function $\Phi_0$ of a metal is defined by the relation $\Phi_0 = \frac{hc}{\lambda_{th}}$,where $h$ is Planck's constant,$c$ is the spee

Vedclass · Accepted Answer

$2.28$

Vedclass · Answer

(B) The work function $\Phi_0$ of a metal is defined by the relation $\Phi_0 = \frac{hc}{\lambda_{th}}$,where $h$ is Planck's constant,$c$ is the speed of light,and $\lambda_{th}$ is the threshold wavelength.Given $\lambda_{th} = 5420 \ \mathring A$.Using the shortcut formula $\Phi_0 (	ext{in } eV) = \frac{12400}{\lambda_{th} (	ext{in } \mathring A)}$.Substituting the value: $\Phi_0 = \frac{12400}{5420} \ eV$.$\Phi_0 \approx 2.28 \ eV$.

Light of wavelength $4000 \ \mathring A$ is incident on a sodium surface,where the threshold wavelength for photoemission is $5420 \ \mathring A$. The work function of sodium is ............ $eV$.

Similar Questions

The quantum nature of light is explained by which of the following phenomena?

The figure represents the graph of photoelectric current $I$ versus applied voltage $(V)$. The maximum kinetic energy of the emitted photoelectrons is

Which of the following does not support the wave nature of light?

In Lenard's experiment,what is the effect on the photoelectric current when ultraviolet radiation incident on the cathode is stopped?

After a photon is incident on a metal surface,the time taken for the emission of a photoelectron from the surface is approximately ...........

Vedclass Test Series

Exam Paper Generator

Online Exam Module