When a surface is irradiated with light of wavelength

PHYSICS · Single correct · CBSE · Physics · Dual Nature of Radiation and Matter · Dual Nature of Radiation and Matter

Problem

4950\,\text{\AA}

, a photocurrent appears which vanishes if a retarding potential greater than

0.6\,\text{V}

is applied across the phototube. When a second source of light is used, the critical retarding potential changes to

1.1\,\text{V}

. The wavelength of the second source is: (1)

6150\,\text{\AA}

(2)

5150\,\text{\AA}

(3)

4125\,\text{\AA}

(4)

4500\,\text{\AA}