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Q.

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
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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