A Photocathode Whose Work Function Is 2.

Question 60
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