When electromagnetic radiation of wavelength 300 {\nm} falls on the surface of a metal, electrons are emitted with the kinetic energy of 1.68 \times 10^5 {\J} {\mol}^{-1}. What is the minimum energy needed to remove an electron from the metal ? ( {\h}=6.626 \times 10^{-34} {\Js}, {\c}=3 \times 10^8 {\ms}^{-1}., . {\N}_{ {\A}}=6.022 \times 10^{23} {\mol}^{-1}) [NEET Re-2022]

Correct Answer is : 2.31×105J1−1

2.31 \times 10^5 {\J} {\mo1}^{-1}

2.31 \times 10^6 {\J} {\mo1}^{-1}

3.84 \times 10^4 {\J} {\mo1}^{-1}

3.84 \times 10^{-19} {\J} {\mo1}^{-1}

Class 11 NEET Chemistry Structure Of Atom Questions

Question : 14 of 84

Marks: +1, -0

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)

[NEET Re-2022]

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

Validate

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