How many orbitals are possible in
a. 4th energy level b. `5f` sub-shell

Explanation

a.In the fourth energy , the value for the principal quantum number is `4`
:. Number of orbitals in `n = 4` is` n^(2)= 4^(2) = 16`
b. IN `5l` sub shell , `l= 3`
:. Number of orbital `= (2l + !) = 2 xx 3 = 1 = 7`