Physics

Problem

Monochromatic light of wavelength

400\,\text{nm}

falls normally on two different metal surfaces A and B. The work functions are

2.5\,\text{eV}

for A and

4.0\,\text{eV}

for B. (Use

h=6.63\times10^{-34}\,\text{J s}

c=3.0\times10^{8}\,\text{m s}^{-1}

e=1.6\times10^{-19}\,\text{C}

.) a. (i) Which metal will emit photoelectrons under this illumination? b. (ii) Calculate the stopping potential required to just halt the most energetic electrons emitted from that metal.

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