# Hmwk4 - Chem2070 Homework#4 Fall 2011 Due September 23 1...

This preview shows pages 1–2. Sign up to view the full content.

Chem2070 Fall 2011 Homework #4: Due September 23 1. Suppose an atom in an excited state can return to the ground state in two steps. If first falls to an intermediate state emitting radiation of wavelength λ 1 , and then to the ground state, emitting radiation of wavelength λ 2 . The same atom can also return to the ground state in one step, emitting one photon of wavelength λ . How are λ, λ 1 , and λ 2 related? How are their frequencies related (in both cases, write an algebraic expression, not a word explanation). 2. In the Bohr model, the energy of an electron orbital is E n ( Z ) = 1 . 097 × 10 7 m Z 2 n 2 = 1 91 . 16 nm Z 2 n 2 for nuclear charge Z , and the electron orbits the nucleus at a distance r n = n 2 Z a 0 where a 0 = 0 . 053 nm. (a) Without any detailed calculations, indicate which of the following energy transi- tions in He + requires absorption of the most energetic photon. i. from n i = 1 to n f = 2 ii. from n i = 2 to n f = 4 iii. from n i = 3 to n f = 9 iv. from n i = 10 to n f = 1

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern