9. The number of emission lines coming from an atom with these 5 energy levels is:

Fourth excited state ____________________________ 7 eV

Third excited state ___________________________ 6.5 eV

Second excited state ____________________________ 5.3 eV

First excited state ____________________________ 3.7 eV

Ground state _____________________________0.0 eV

   b.10

You can count all the transitions as done in Tutorial 1, or you can simply add the transitions:

There can be 4 "jumps" from HIGHER LEVELS into the ground state, 3 into the first excited, 2 into the second excited and 1 into the third excited.

That's 4+3+2+1=10 transitions.