(Solved): A light beam with a wavelength I=475nm is incident on a polished metal plate (Emitter) with Work- ...

A light beam with a wavelength $\mathrm{I}=475\mathrm{nm}$ is incident on a polished metal plate (Emitter) with Work-function $3.2\mathrm{eV}$, that is connected to ground $(\mathrm{V}=0)$. Initially, the Voltage on the Collector plate is +5 Volts and a current is seen to flow through the ammeter shown. Then, the voltage on the Collector plate is adjusted until the current just stops. Including the sign, what is the new voltage on the Collector plate in Volts?