Question

The energy of hydrogen atom in its ground state is -13.6 the energy of the level corresponding to the quantum number n is equal to 5

Answer 1

Well, the formula is ((13.6)Z^2)/n^2

for h atom z=1 and n=5(given)
therefore energy is 13.6/25=0.544 eV

Answer 2

Energy = -13.6/n²

Here, n = 5

Hence energy = -13.6/25

= -0.544 eV.