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
Correct Answer:
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