Work-function of caesium is \( 2.14 \mathrm{eV} \). Threshold frequ...

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Work-function of caesium is \( 2.14 \mathrm{eV} \). Threshold frequency of caesium is
(a) \( 5.14 \times 10^{14} \mathrm{~Hz} \)
(b) \( 6 \times 10^{14} \mathrm{~Hz} \)
(c) \( 3 \times 10^{14} \mathrm{~Hz} \)
(d) \( 5.16 \times 10^{14} \mathrm{~Hz} \)
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