When a certain metal surface is illuminated w | vedclass

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

Question

(C) According to Einstein's photoelectric equation,the maximum kinetic energy $K_{max}$ of the emitted photoelectrons is given by $K_{max} = h v - h v

Vedclass · Accepted Answer

$v/3$

Vedclass · Answer

(C) According to Einstein's photoelectric equation,the maximum kinetic energy $K_{max}$ of the emitted photoelectrons is given by $K_{max} = h v - h v_0$,where $v_0$ is the threshold frequency.Since the stopping potential $V_s$ is related to the maximum kinetic energy by $K_{max} = e V_s$,we have $e V_s = h v - h v_0$ ... $(1)$.For the second case,with frequency $v/2$ and stopping potential $V_s/4$,we have $e(V_s/4) = h(v/2) - h v_0$ ... $(2)$.From equation $(1)$,$e V_s = h v - h v_0$. Substituting this into equation $(2)$ multiplied by $4$:$e V_s = 4(h v/2 - h v_0) = 2h v - 4h v_0$.Equating the two expressions for $e V_s$:$h v - h v_0 = 2h v - 4h v_0$.Rearranging the terms: $3h v_0 = h v$.Therefore,$v_0 = v/3$.

When a certain metal surface is illuminated with light of frequency $v$,the stopping potential for the photoelectric current is $V_s$. When the same surface is illuminated by a light of frequency $v/2$,the stopping potential is $V_s/4$. The threshold frequency of photoelectric emission is

Similar Questions

According to Einstein's photoelectric equation, the graph between the kinetic energy of photoelectrons ejected and the frequency of incident radiation is

The stopping potential for photoelectrons:

Light described at a place by the equation $\varepsilon = (100 \text{ V/m}) [\sin(5 \times 10^{15} \text{ s}^{-1})t + \sin(8 \times 10^{15} \text{ s}^{-1})t]$ falls on a metal surface having a work function of $2 \text{ eV}$. Calculate the maximum kinetic energy of the photoelectrons in $\text{eV}$.

The work function of a surface of a photosensitive material is $6.2\, eV$. The wavelength of the incident radiation for which the stopping potential is $5\, V$ lies in the

Assuming photoemission to take place,the factor by which the maximum velocity of the emitted photoelectrons changes when the wavelength of the incident radiation is increased four times,is

Vedclass Test Series

Exam Paper Generator

Online Exam Module