5.
The work function for tungsten and sodium are 4.5 eV and 2.3 eV respectively. If the threshold wavelength a
for sodium is 5460 A, the value of wavelength for tungsten is
(1) 5893 Å
(2) 10683 Å
(3) 2791 À
(4) 528 Å
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Answer:
3. 2791 Å is the correct answer
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