Answer:1 Boiling
Explanation:
Salt (Solute) + water (solvent) = Solution.
Salt dissolves in water, therefore, the only way to recover the salt is by boiling (evaporation) the solution.
I attached the working and the answer to both questions below.
Please note that E = energy, ν = frequency, h = Plank's Constant
<span>The energy of a 4.66 x 10</span>¹⁴<span> Hz wave is
3.088 </span>
× <span>
10</span>
⁻¹⁷ J