If threshold wavelength \( \left(\lambda^{\circ}\right) \) for ejection of electron from metal i...

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If threshold wavelength \( \left(\lambda^{\circ}\right) \) for ejection of electron from metal is \( 330 \mathrm{~nm} \), then work function for the photoelectric emission is:
(1) \( 6 \times 10^{-10} \mathrm{~J} \)
(2) \( 1.2 \times 10^{-18} \mathrm{~J} \)
(3) \( 3 \times 10^{-19} \mathrm{~J} \)
(4) \( 6 \times 10^{-19} \mathrm{~J} \)
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