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JEE Advanced 2011Paper 1
Exam
JEE Advanced
Year
2011
Paper
Paper 1
Subject
Chemistry
Chapter
Structure of Atom

JEE Advanced 2011 · Paper 1 · Chemistry · Structure of Atom

The work function ( ) of some metals is listed below. The number of...

The work function ( Φ\Phi ) of some metals is listed below. The number of metals which will show photoelectric effect when light of 300 nm300 \mathrm{~nm} wavelength falls on the metal is The work function ( ) of some metals is listed below. The number of metals which will show photoelectric effect when

Correct answer

4

Step-by-step solution

Energy of photon =hcλJ=hceλeV=6.625×10−34×3×108300×10−9×1.602×10−19=4.14eV=\frac{h c}{\lambda} \mathrm{J}=\frac{h c}{e \lambda} \mathrm{eV}=\frac{6.625 \times 10^{-34} \times 3 \times 10^8}{300 \times 10^{-9} \times 1.602 \times 10^{-19}}=4.14 \mathrm{eV} For photoelectric effect to occur, energy of incident photons must be greater than work function of metal. Hence, only Li,Na,K\mathrm{Li}, \mathrm{Na}, \mathrm{K} and Mg\mathrm{Mg} have work functions less than 4.14 V4.14 \mathrm{~V}.
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