The work function of a metal is \( 4.2 \mathrm{eV} \), its threshold wavelength will be (A) \( 4...
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0The work function of a metal is \( 4.2 \mathrm{eV} \), its threshold wavelength will be
(A) \( 4000 \AA \)
(B) \( 3500 \AA \)
(C) \( 2955 \AA \)
(D) \( 2500 \AA \)
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