NEET Questions Solved


The work function of a metal is 4.2 eV, its threshold wavelength will be 
(a) 4000 Å                    (b) 3500 Å
(c) 2955 Å                    (d) 2500 Å

(c) W0eV=12375λ0λ0=123754.22955  Å

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