Question

electromagnetic radiation wavelengthelectromagnetic radiation wavelength 242 NM is just sufficient to ionize the sodium atom calculate the ionization energy of sodium in kilo joule per mole ​

Answer 1

$\huge\underline{\underline\mathtt\color{hotpink}Answer}$

$\longrightarrow \bold{ Wavelength \: of \: light \: used \: (\lambda )\: = 242nm = 242 \: x \:10^{-9 }m}$

$\longrightarrow \bold \red {E = \frac{hc}{ lamda} }$

$\longrightarrow \bold{ E = \frac{19.878 \times 10^ { - 26}}{242 \times 10^ { - 9}} }$

$\longrightarrow \bold{ E = 494 \: kJ \: mol ^{-1}}$