A metallic surface is illuminated alternately with light of wavelengths and

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

Problem

A metallic surface is illuminated alternately with light of wavelengths

3000\ \text{\AA}

and

6000\ \text{\AA}

. It is observed that the maximum speeds of the photoelectrons under these illuminations are in the ratio

3:1

. Calculate the work function of the metal and the maximum speed of the photoelectrons in the two cases.