Physics

Problem

For a certain metal surface the following observations are made: • Incident frequency

6.0\times10^{14}\,\text{Hz}

gives stopping potential

0.5\,\text{V}

. • Incident frequency

9.0\times10^{14}\,\text{Hz}

gives stopping potential

2.0\,\text{V}

. Using these data, the work function of the metal is closest to a)

1.5\,\text{eV}

4.5\,\text{eV}

2.5\,\text{eV}

3.0\,\text{eV}