Electronic Devices and Circuits - Engineering

Q1:

The work function of a photo surface whose threshold wave length is 1200 A, will be

A 0.103 eV

B 0.673 eV

C 1.03 eV

D 1.27 eV

ANS:C - 1.03 eV

E(ev) = 12400/(wave length in Angstrom).

According to answer, the wavelength may be 12000 A° instead of 1200 A°.