Statement I : Both 3s orbital and 4s orbital have same number of angular nodes.

Statement II : Both 3s orbital and 4s orbital have same number of radial nodes.

Number of angular nodes = l ; l =0 for any s-orbital.

Number of radial nodes = n - l - 1; 

Number of radial nodes (3s) = 3 - 0 - 1 ;

Number of radial nodes (4s) = 4 - 0 - 1 ;