JEE CHEMISTRY MCQ: STRUCTURE OF ATOM

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When lithium metal is irradiated with light of different wavelengths leads to stopping potential of

1.83 \mathrm{~V}

for

\lambda=3000 \mathrm{~A}^0

and

0.80 \mathrm{~V}

for

\lambda=4000 \mathrm{~A}^0

with the known charge on the electron, what is the work function of lithium?

View answer and explanation

Correct option: A

2.3 \mathrm{~eV}

Option A (

2.3 \mathrm{~eV}

) is correct because it is calculated by using the photoelectric equation

E = \phi + eV_s

, where E is the energy of the photon,

\phi

is the work function, and

V_s

is the stopping potential.

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