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JEE Main 202125 FebruaryEvening Shift
Exam
JEE Main
Year
2021
Date
25 February
Shift
Evening Shift
Subject
Chemistry
Chapter
Structure of Atom

JEE Main 2021 · 25 February · Evening Shift · Chemistry · Structure of Atom

Electromagnetic radiation of wavelength 663nm is just sufficient to...

Electromagnetic radiation of wavelength 663nm663nm is just sufficient to ionise the atom of metal AA. The ionization energy of metal AinkJmol−1A in kJ{mol}^{- 1} is ___. (Rounded-off to the nearest integer) [h=6.63×10−34Js,c=3.00×108ms−1,NA=6.02×1023mol−1]\left[h = 6 . 63 \times {10}^{- 34}Js, c = 3 . 00 \times {10}^{8}{ms}^{- 1}, {N}_{A} = 6 . 02 \times {10}^{23}{mol}^{- 1}\right]

Correct answer

0

Step-by-step solution

E=hcλ×NA1000E = \dfrac{hc}{\lambda} \times \dfrac{{N}_{A}}{1000}

=6.63×10−34×3×108×6.02×1023663×10−9×1000= \dfrac{6 . 63 \times {10}^{- 34} \times 3 \times {10}^{8} \times 6 . 02 \times {10}^{23}}{663 \times {10}^{- 9} \times 1000}

=3×6.02×10kJ= 3 \times 6 . 02 \times 10kJ

=180.6kJ= 180 . 6kJ

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