A Photocathode Whose Work Function Is 2

Multiple Choice

A photocathode whose work function is 2.9 eV is illuminated with white light that has a continuous wavelength band from 400 nm to 700 nm.What is the range of the wavelength band in this white light illumination for which photoelectrons are not produced? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s,1 eV = 1.60 × 10^-19 J)

A) 430 nm to 700 nm
B) 400 nm to 480 nm
C) 430 nm to 480 nm
D) 400 nm to 430 nm
E) 480 nm to 700 nm