Midterm Practice Test #11

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Lauren Tindall
Posts: 15
Joined: Sat Aug 24, 2019 12:17 am

Midterm Practice Test #11

Postby Lauren Tindall » Tue Nov 05, 2019 7:24 pm

11. a) An excited hydrogen atom undergoes an electronic transition from n=3 to n=1. Calculate the frequency of the photon emitted.
11. b) If a hydrogen electron goes from n=6 to n=4, will ∆E be negative or positive? Will the energy of the photon emitted be negative or positive?

I missed the end of the review session, so I was unable to see how this problem was solved. How do you solve it?

nicolely2F
Posts: 113
Joined: Sat Sep 14, 2019 12:17 am

Re: Midterm Practice Test #11

Postby nicolely2F » Tue Nov 05, 2019 11:39 pm

For the first one just use either Rydberg's equation or Bohr's Frequency Condition (if you choose this, calculate En for n = 3 and n = 1 and plug those into delta E = h.v).
For the second, remember that outer layers are more energetic than inner ones, so if an electron moves from an outer shell to an inner one, delta E is going to be negative. Energy can't be negative (we only use negative / positive signs in calculations to represent absorption or emission of energy).


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