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  4. Work function of a metal is 5.26 × 10-18 then its threshold wavelength will be :

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Q. Work function of a metal is $5.26 \times 10^{-18}$ then its threshold wavelength will be :

Rajasthan PMTRajasthan PMT 2000Dual Nature of Radiation and Matter

Solution:

Work function $W=\frac{h c}{\lambda}$
$\lambda =\frac{h c}{W} $
$=\frac{6.6 \times 10^{-34} \times 3 \times 10^{8}}{5.26 \times 10^{-18}}=344.4 \,\mathring{A}$