Class Notes (806,680)
Canada (492,403)
Physics (299)
PHYS 183 (60)
Tracy Webb (34)
Lecture 12

Lecture 12

1 Page
Unlock Document

McGill University
PHYS 183
Tracy Webb

PHYS 183 – The Milky Way Inside and Out – Tracy Webb Winter 2013 Lecture 12: February 1 , 2013  each kind of atom has a unique set of energy levels  each transition corresponds to a unique frequency, wavelength & energy  electrons falling will emit certain amounts of energy which will emit certain amounts of light corresponding to a specific colour based on wavelength or frequency  these are called chemical fingerprints  they are different for every single element  downward transitions give us emission lines  electrons lose energy as they fall closer to the nucleus (similar to gravitational potential energy)  upward transitions give us absorption lines  electrons gain energy as they move farther from nucleus o photons with exact energies are absorbed  absorption and emission spectra are the opposite of each for the same element  different elements have different fingerprints  He corresponds with almost all colour, Na is only in the orange spectrum & neon is only in the red and orange spectrum  don’t have to memorize these*  the combined fingerprint of the spectrum of an object tells us the composition of gasses that the object is made up of o ie/ know that Orion Nebula is made up of H, He, O and Ne based on the lines of the spectra  the solar spectrum o continuous spectrum produced in the core o outer atmosphere absorbs photons according to its composition (absorption lines) o hot den
More Less

Related notes for PHYS 183

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.