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All electrons ejected from a surface by incident light of wavelength 200 nm can be stopped before travelling 1 m in the direction of uniform electric field of 4N/C. The work function of the surface is – |
4 eV 6.2 eV 2 eV 2.2 eV |
2.2 eV |
$V_s = E.d$ $V_s = 4Volt$ $eV_s = \frac{12400}{λ}– W$ $4 eV =\frac{12400eV}{2000}– W$ 4eV = 6.2eV – W [W = 2.2 eV] |
