Sodium and copper have work function 2.3 eV and 4.5 eV respectively

Sodium and copper have work function 2.3 eV and 4.5 eV respectively. The ratio of their threshold wavelengths is nearest to

Options

(a) 1 : 2
(b) 4 : 1
(c) 2 : 1
(d) 1 : 4

Correct Answer:

2 : 1

Explanation:

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