The work function for a metal is 4.14 eV. The threshold wavelength for this metal surface is: $(h=6.62×10^{-34}Js, c=3×10^8 ms^{-1})$

4135 Å 6000 Å 2062.5 Å 3000 Å

3000 Å

The correct answer is Option (4) → 3000 Å