An atom is in the state whose multiplities is three and the total angular momentum is `ħsqrt(20)`. What can the corresponding quantum number `L` be equal to?

Explanation

Multiplicity is `2S+1 so S=1`
Total angular momentum is ` ħsqrt(J(J+1))` so `J=4`. Then `L` must be equal `3,4,5`
in order that `J=4` may be included in
`|L-S| to L + S`