Light of wavelength \( \lambda \) falls on metal having work function \( \mathrm{hc} / \lambda_{...

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Light of wavelength \( \lambda \) falls on metal having work function \( \mathrm{hc} / \lambda_{0} \). Photoelectric effect will take place only if :
(a) \( \lambda \geq \lambda_{0} \)
(b) \( \lambda \geq 2 \lambda_{0} \)
(c) \( \lambda \leq \lambda_{0} \)
(d) \( \lambda \leq \lambda_{0} / 2 \)
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