In order to find the exponential form, we can use the property below:
[tex]\sqrt[c]{a^b}=a^{\frac{b}{c}}[/tex]
So, for the square root of 10, we have:
[tex]\sqrt{10}=\sqrt[2]{10^1}=10^{\frac{1}{2}}[/tex]
Therefore the correct option is the fourth one.
