Monochromatic light of wavelength falls normally on two different metal surfaces A and B

PHYSICS · Multi-part · CBSE · Physics · Dual Nature of Radiation and Matter · Dual Nature of Radiation and Matter

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}

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

Related theory

Electron Emission
Einstein's Photoelectric Equation
Quantum Explanation of PE
Photoelectric effect
The photoelectric effect
Dual Nature of Radiation and Matter

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