If the threshold wavelength (λ₀) for the ejection of an electron from metal is 330 nm, then work function for the photoelectric emission is:

A 1.2 × 10⁻¹⁸ J
B 1.2 × 10⁻²⁰ J
C 6 × 10⁻¹⁹ J
D 6 × 10⁻¹² J