Electromagnetic radiation of wavelength 242 nm is just sufficient to ionize sodium atom. Calculate the ionization energy of sodium atom. `c= 3 xx 10^8 ms^(-1), h=6.626 xx 10^(-34) Js` .

Explanation

To calculate the ionization energy of a sodium atom given the wavelength of electromagnetic radiation, we can use the formula for energy of a photon:

\[ E = \frac{hc}{\lambda} \]

where:
- \( E \) is the energy,
- \( h \) is Planck's constant (\( 6.626 \times 10^{-34} \, \text{Js} \)),
- \( c \) is the speed of light (\( 3 \times 10^8 \, \text{ms}^{-1} \)),
...