A metallic surface is irradiated with monochromatic light of variable wavelength

PHYSICS · Numerical · CBSE · Physics · Dual Nature of Radiation and Matter · Dual Nature of Radiation and Matter

Problem

A metallic surface is irradiated with monochromatic light of variable wavelength. Above a wavelength of

5000\,\text{\AA}

, no photoelectrons are emitted from the surface. With an unknown wavelength, a stopping potential of

3\,\text{V}

is necessary to eliminate the photocurrent. Find the unknown wavelength.