According to aufbau principle, the correct order of energy of \(4 p\) and \(5 s -\) orbitals is \(4 p \,<\,5 s\)

Aufbau principle:

In the ground state of the atoms, the orbitals are filled with electrons in order of increasing energy.

The \(4 p\) sub-energy level is at a lower energy than the \(5 s\) sub-energy level

For \(4 p, n=4\) and \(1=1\). Hence, \((n+1)=4+1=5\)

For \(5 s , n =5\) and \(1=0\). Hence, \(( n +1)=5+0=5\)

As the value of \(( n +1)\) for \(4 p\) orbital is same as that of \(5 s\) orbital, \(4 p\) orbital is filled before \(5 s\) orbital as \(4 p\) orbital has lower value of \(n\) than \(5 s\) orbital.