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.The range of the wavelength band in this white light illumination for which photoelectrons are not produced,in nm,is closest to:

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