Dual Nature of Matter

JEE Main level, single correct, medium

133 of 200

Question 133 of 200

If the two metals AA and BB are exposed to radiation of wavelength 350nm350nm. The work functions of metals AA and BB are 4.8eVand2.2eV4.8eV\text{and}2.2eV. Then choose the correct option

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Answer: (D) Metal AA will not emit photo-electrons

As we know, for photoelectric emission, hν>ϕh\nu \gt \phi.
Now,
hν=hcλ=1240350eV=3.54eVh\nu =\dfrac{hc}{\lambda }=\dfrac{1240}{350}eV=3.54eV
Therefore, only metal BB will emit photoelectrons.

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