Question
Question: Threshold wavelength for photoelectric emission from a metal surface is 5200 Å. Photoelectrons will ...
Threshold wavelength for photoelectric emission from a metal surface is 5200 Å. Photoelectrons will be emitted when this surface is illuminated with monochromatic radiation from.
A
1 W IR lamp
B
50 W UV lamp
C
50 W IR lamp
D
10 W IR lamp
Answer
50 W UV lamp
Explanation
Solution
λ = 5200 Å is invisible region required wavelength should be smaller than threshold wavelength.