Electromagnetic radiation of wavelength 242 nm is just sufficient to ionise the sodium atom . Calculate the ionisation energy of sodium in kJ `mol^(-1)`.

Explanation

To calculate the ionization energy of sodium in kJ/mol given the wavelength of electromagnetic radiation, we can follow these steps:

### Step 1: Convert Wavelength to Meters
The wavelength (λ) is given as 242 nm. We need to convert this to meters.

\[ \lambda = 242 \, \text{nm} = 242 \times 10^{-9} \, \text{m} \]
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