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Work function of tungsten and sodium are...

Work function of tungsten and sodium are 4.4 eV and 2.3 eV respectively . If threshold wavelength of sodium is 5460 Å , then the threshold wavelength of tungsten is

A

2854 Å

B

4840 Å

C

5460 Å

D

2730 Å

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The correct Answer is:
A
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