Structure Of Atom Question 12
Question 12 - 2024 (31 Jan Shift 1)
The ionization energy of sodium in $kJmol^{-1}$. If electromagnetic radiation of wavelength $242 nm$ is just sufficient to ionize sodium atom is ________.
Show Answer
Answer (494)
Solution
$E=\frac{1240}{\lambda(nm)} eV$
$=\frac{1240}{242} eV$
$=5.12 eV$
$=5.12 \times 1.6 \times 10^{-19}$
$=8.198 \times 10^{-19} J /$ atom
$=494 kJ / mol$
