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Class 11 NEET Chemistry Structure Of Atom Questions

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Question : 12

Total: 82

When electromagnetic radiation of wavelength 300‌nm falls on the surface of a metal, electrons are emitted with the kinetic energy of 1.68×105Jmol−1. What is the minimum energy needed to remove an electron from the metal ?
(h=6.626×10−34‌Js,c=3×108ms−1.,
.NA=6.022×1023mol−1)

2.31×105J1−1
2.31×106J1−1
3.84×104J1−1
3.84×10−19J1−1

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