In photoelectric effect, the stopping potential ( V _0 ) v / s fr… - Vidyadip

MCQ

In photoelectric effect, the stopping potential $\left( V _0\right)$ $v / s$ frequency ( v ) curve is plotted.
(h is the Planck's constant and $\phi_0$ is work function of metal)
(A) $V _0 v / s v$ is linear
(B) The slope of $V _0 v / s v$ curve $=\frac{\phi_0}{h}$
(C) h constant is related to the slope of $V _0\ v/s\ v$ line
(D) The value of electric charge of electron is not required to determine $h$ using the $V_0\ v/s\ v$ curve.
(E) The work function can be estimated without knowing the value of $h$.
Choose the correct answer from the options given below :

A
(A), (B) and (C) only
B
(C) and (D) only
✓
(A),(C) and (E) only
D
(D) and (E) only

✓

Answer

Correct option: C.

(A),(C) and (E) only

(C) (A),(C) and (E) only
$
\begin{array}{l}Sol.\
hv=\phi+KE_{\max } \\
KE_{\max }=eV_0 \\
V_0=\frac{hv-\phi}{e}
\end{array}
$
(A) $V _0 v / s V$ is linear correct
(B) Slope
$
v_0=\left(\frac{h}{e}\right) v-\frac{\phi}{e} \text { Wrong }
$
Slope $\frac{ h }{ e }$
(C) Correct
(D) Incorrect
(E) Correct

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