The work function for tungsten and sodium are 4.5 eV and 2.3 eV respectively. If the threshold wavelength λ for sodium is 5460 Ao, the value of λ for tungsten is
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a
5893 Ao
b
10683 Ao
c
2791 Ao
d
528 Ao
answer is C.
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Detailed Solution
since Wo=hcλo; ∴WoTWoNa=λNaλT orλT=λNa×WoNaWoT=5460×2.34.5=2791A0
The work function for tungsten and sodium are 4.5 eV and 2.3 eV respectively. If the threshold wavelength λ for sodium is 5460 Ao, the value of λ for tungsten is