When the light of wavelength 4900 Å falls on a photosensitive metal, a negative 2 V potential is required to stop the emitted electrons. Then the work function of the material is nearly _____.
Given charge on electron = 1.602 × 10-19 C and Planck's constant = 6.625 × 10-34 J. s
1
1.1 eV
2
2.2 eV
3
0.53 eV
4
1 eV