Question 347: Dual Nature of Matter and Radiation

Question

The graph of stopping potential $V_s$ against frequency $v$ of incident radiation is plotted for two different metals $P$ and $Q$ as shown in the graph. $\phi_p$ and $\phi_Q$ are work-functions of $P$ and $Q$ respectively, then

Accepted Answer

The work-function of a surface is
$$\phi=h 
u_0$$
where, $h=$ Planck's constant
and $
u_0=$ threshold frequency.
From graph it is clear that,
$$\begin{gathered}
\left(
u_0ight)_p<\left(
u_0ight)_0 \
	herefore\quad\phi_p<\phi_Q
\end{gathered}$$

Answer

$\phi_P>\phi_Q$

Answer

$\phi_P<\phi_Q$

Answer

$\phi_P=\phi_Q$

Answer

$
u_0^{\prime}<
u_0$

Dual Nature of Matter and Radiation

The graph of stopping potential V_s against frequency v of incident radiation is plotted for two different metals P and Q as shown in the graph. \phi_p and \phi_Q are work-functions of P and Q respectively, then

Choose the correct answer: