In a photoelectric experiment on an unknown metal

PHYSICS · Multi-part · A Level · Physics · Particles and radiation · Particles and radiation

Problem

In a photoelectric experiment on an unknown metal, the following observations are recorded: • When light of frequency

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

is used, the stopping potential is

0.50\,\text{V}.

• When the frequency is raised to

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

, the stopping potential becomes

2.00\,\text{V}.

Assume that the charge of an electron is

1.6\times10^{-19}\,\text{C}.

(a) Using the above data, determine the numerical value of Planck’s constant

h

(in

\text{J\,s}

). (b) Calculate the work function of the metal in

\text{eV}.