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## QUANTUM MECHANICS

by: Hailey Halvorson

48

0

1

# QUANTUM MECHANICS PHYS 115A

Hailey Halvorson
UCSB
GPA 3.8

Staff

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COURSE
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Staff
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Class Notes
PAGES
1
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KARMA
25 ?

## Popular in Physics 2

This 1 page Class Notes was uploaded by Hailey Halvorson on Thursday October 22, 2015. The Class Notes belongs to PHYS 115A at University of California Santa Barbara taught by Staff in Fall. Since its upload, it has received 48 views. For similar materials see /class/227145/phys-115a-university-of-california-santa-barbara in Physics 2 at University of California Santa Barbara.

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Date Created: 10/22/15
UNIVERSITY OF CALIFORNIA SANTA BARBARA Department of Physics 2011 FALL STARS Professor Martin HOMEWORK 1 Due Friday September 30th Assigned Reading Phillips chapter 1 and 21 23 Problem 1 Radiation Consider two stars The Cool Star has an effective surface temperature of 6000 K and a radius of R0 The Hot Star has Teff 30 000 K and R 8R9 where R0 is the radius of the sun and is approximately equal to 7 gtlt 1010 cm Assume that the spectra of these stars are well approximated by a blackbody spectrum for their effective temperature a2pts Find the wavelength where each stellar spectrum is brightest b2ts For each star nd the fraction of the emitted energy that can ionize a hydrogen atom Assume the electron is in the n 1 level so the ionization potential is 136 eV c2pts Calculate the bolometric luminosity of each star Express your answer in units of the solar luminosity You can nd the value of the solar luminosity inside the back cover of Phillips d 1pt Calculate the absolute magnitude M of each star e 1pt Both stars are 100 parsecs away from the observer Calculate the apparent magnitude seen by the observer use the distance modulus m 7 M Hint A parsec is the distance at reach one Astronomical Unit subtend an angle of 1 See the back cover of Phillips for its value in MKS Note This problem forces you to review two topics blackbody radiation and the inverse square law that you have used in the lower division physics classes Refer back to your old texts if you would like to see their derivation The equations you need can be found in either the slides from the rst lecture or the assigned reading in Phillips

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