How can i solve a recursion equation with square root using recursion tree method?
If you apply the recursive formula again to $T(n/2)$ you get the following:
$$ T(n) = \sqrt{2}\cdot T(n/2) + \sqrt{n} \\T(n)= \sqrt{2}(\sqrt{2}\cdot T(n/4) + \sqrt{n/2}) + \sqrt{n} \\T(n)= 2\cdot T(n/4) + 2\sqrt{n}$$

For this formula you are now probably able to draw a recursion tree.