What is e of a hydrogen atom in the 3p state?
what is l (as a multiple of ℏ) of a hydrogen atom in the 3p state?

E=-1.51 eV.

Explanation:

The nth level energy of a hydrogen atom is defined by the formula,

Given in the question, the hydrogen atom is in the 3p state.

Then energy of n=3 state is,

Therefore, energy of the hydrogen atom in the 3p state is -1.51 eV.

Now, the value of L can be calculated as,

For 3p state, l=1

Therefore, the value of L of a hydrogen atom in 3p state is .

t = 1/400 h   ⇔ 0.0025 h ⇔ 9s ⇔ 0.15 m

any of the answers are correct.