The stopping potential \(V\) for photoelectric emission from a metal surface is plotted along the \(Y\text-\)axis and the frequency \(\nu\) of incident light along the \(X\text-\)axis. A straight line is obtained as shown in the figure. Planck's constant is given by:
             

1.	the slope of the line.
2.	the product of slope on the line and charge on the electron.
3.	the product of intercept along the \(Y\text-\)axis and mass of the electron.
4.	the product of the slope and mass of the electron.

In an experiment on the photoelectric effect, the frequency \(f\) of the incident light is plotted against the stopping potential \(V_0.\) The work function of the photoelectric surface is given by:
(\(e\) is an electronic charge) 

The stopping potential as a function of the frequency of the incident radiation is plotted for two different photoelectric surfaces \(A\) and \(B\). The graphs demonstrate that \(A\)'s work function is:

The value of stopping potential in the following diagram is given by:
    

In the following diagram if ${\mathrm{V}}_2>{\mathrm{V}}_1$, then,

(1) ${\mathrm{\lambda }}_1=\sqrt{{\mathrm{\lambda }}_2}$

(2) ${\mathrm{\lambda }}_1<{\mathrm{\lambda }}_2$

(3) ${\mathrm{\lambda }}_1={\mathrm{\lambda }}_2$

(4) ${\mathrm{\lambda }}_1>{\mathrm{\lambda }}_2$

A point source of light is used in an experiment on photoelectric effects. Which of the following curves best represents the variation of photocurrent \((i)\) with distance \((d)\) of the source from the emitter?

The stopping potential \((V_{0})\) versus frequency \((\nu_{0})\) plot of a substance is shown in the figure. What will be the threshold wavelength?