198- In a photoelectric experiment, the graph of stopping voltage versus frequency of incident light on two metals A and B is shown in the figure below. If light with frequency $10^{15}$ Hz is incident on both metals; the stopping voltage of metal A is $\dfrac{1}{2}$; what is the stopping voltage of metal B? $(h = 4\times10^{-15}\ \text{ev.s})$ [Figure: Graph of stopping voltage $V_0$ (vertical axis) vs. frequency $f(10^{15}\ \text{Hz})$ (horizontal axis), showing two lines A and B intersecting the horizontal axis at different points. Line A has a steeper slope. The vertical axis shows values $\frac{1}{2}$ and $\frac{1}{4}$, and the horizontal axis shows values $\frac{3}{4}$ and $1$.] (1) $\dfrac{1}{2}$ (2) $\dfrac{3}{2}$ (3) $1$ (4) $2$
\textbf{198-} In a photoelectric experiment, the graph of stopping voltage versus frequency of incident light on two metals A and B is shown in the figure below. If light with frequency $10^{15}$ Hz is incident on both metals; the stopping voltage of metal A is $\dfrac{1}{2}$; what is the stopping voltage of metal B? $(h = 4\times10^{-15}\ \text{ev.s})$
\textit{[Figure: Graph of stopping voltage $V_0$ (vertical axis) vs. frequency $f(10^{15}\ \text{Hz})$ (horizontal axis), showing two lines A and B intersecting the horizontal axis at different points. Line A has a steeper slope. The vertical axis shows values $\frac{1}{2}$ and $\frac{1}{4}$, and the horizontal axis shows values $\frac{3}{4}$ and $1$.]}
\hspace{1cm} (1) $\dfrac{1}{2}$ \hspace{2cm} (2) $\dfrac{3}{2}$ \hspace{2cm} (3) $1$ \hspace{2cm} (4) $2$