The stopping potential V0 (in volt) as a function of frequency (v) for a sodium emitter, is shown in the figure. The work function of sodium, from the data plotted in the figure, will be : (Given : Planck's constant (h)=6.63×10−34Js, electron charge e=1.6×10−19C)
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Correct option is C)
hv=ϕ+ev0 v0=ehv−eϕ v0 is zero fro v=4×1014Hz 0=ehv−eϕ⇒ϕ=hv =1.6×10−196.63×10−34×4×1014=1.66eV.
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