A) 400 W, infrared lamp
B) 10 W, ultraviolet lamp
C) 100 W, ultraviolet lamp
D) Both [b] & [c]
Correct Answer: D
Solution :
Option [d] is correct. Explanation: The incident wavelength should be less than threshold wavelength for photoelectric emission. IR has wavelength more than 600 nm. UV has wavelength less than 600 nm. So, photoelectrons emitted when illuminated by UV lamp either 100 W or 10 W
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