Threshold wavelength for a metal having work function `w_(0)` is `lambda`. Then the threshold wavelength for a metal having work function `2 w_(0)` is
Threshold wavelength for a metal having work function `w_(0)` is `lambda`. Then the threshold wavelength for a metal having work function `2 w_(0)` is
A. `4lambda`
B. `2lambda`
C. `lambda//2`
D. `lambda//4`
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