# Exam _4 Review Sheet by malj

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```									Astronomy and Astrophysics                                          Teacher: Ms. Ritchie

Exam #1 Review Sheet: Atomic Energy Levels and EM Spectrum

YOU WILL BE PROVIDED A PHYSICAL SCIENCE REFERENCE TABLE!
A CALCULATOR IS REQUIRED!

Aims covered on this Exam:                      Aim #7: How do we classify stars?
Aim #1 Characteristics of Light
Aim #2 Types of Telescopes
Aim #4 Wien's Law                               + Associated homework for each Aim
Aim #5 Stefan-Boltzmann Law                     + Associated Labs on Hydrogen Atom
Aim #6 Atomic Spectra                           and Blackbody Radiation

Chapter Reading: Seeds chapters 6 and 7

These were the aim objectives. You should be capable of performing or interpreting the
following:
1. calculate the speed of light
2. know the electromagnetic spectrum
3. understand light as a wave and particle
4. list different types of telescopes available.
5. know the Earth’s atmospheric window.
6. know how to convert between prefixes
7. understand differences between types of EM radiation.
8. use Wien’s Law to solve between temperature and wavelength.
9. describe characteristics of a black body.
10. use Stefan-Boltzmann Law to solve between temperature and energy/luminosity.
11. convert between energy, frequency and wavelength of light.
12. understand the difference of absorption vs emission spectrums from stars.
13. identify stars by OBMFGKJ.
14. understand Balmer line intensity vs Temp .
15. read and interpret the table for OBAFGKM classification

Sample Essay Questions:
1. How do the energy levels in an atom determine which wavelength photons it can
absorb or emit?
2. Explain why the hydrogen balmer line is strong only in medium hot stars but is weak
for very hot and very cool stars.
3. Explain why hot stars look bluer than cool stars using Wien’s Law.
4. Why would an infared telescope need to be placed at the top of a mountain or in orbit
above Earth’s atmosphere?
5. Why is having an observatory on the lunar surface an advantage?

Sample Multiple Choice: see the multiple choice review sheet previously distributed

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