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  • Judith Irwin's Fall Schedule, 2008
    SCHEDULE 2008 Monday Tuesday Wednesday Thursday Friday 8 30 9 30 Lecture Prep Research Lecture Prep Lecture Prep Research 9 30 10 30 10 30 11 30 11 30 12 30 Phys 107 B ST D 12 30 1 30 Phys 107 B ST D Phys 107 Office Astro Journals Club ST 201 1 30 2 30 Phys 107 Office Phys Colloq ST A Phys 107 B ST D 2

    Original URL path: http://www.astro.queensu.ca/~irwin/schedule_f2008.html (2016-02-13)
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  • PHYSICS 107 - Course Outline
    which gravity is reduced to trivial amounts weightlessness or more correctly microgravity In the picture below some people are getting a ride on the Russian aircraft IL 76 MDK which flies for a while in a parabolic path For about 25 seconds at the top of the orbit weightlessness can be achieved equivalent to free fall The effects are obvious here Less obvious are other effects of prolonged living in

    Original URL path: http://www.astro.queensu.ca/~irwin/phy107/lecture1/biol_physics.html (2016-02-13)
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  • PHYSICS 107 - Course Outline
    Philosopher What do you mean by sound This question has spawned far more discussion than it deserves see for example this student discussion The philosopher has responded appropriately If by sound one means a sound wave then the physicist is correct If by sound one means the interaction of a sound wave with the human ear then the biologist is right The only reason this question has the appearance of

    Original URL path: http://www.astro.queensu.ca/~irwin/phy107/lecture1/tree.html (2016-02-13)
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  • Phys 215 Summary, Info, and Evaluation
    Wesley Publishing Company Text website at http astrophysics weber edu EVALUATION Mark distribution Assignments 5 at 4 each 20 Project 25 Final Exam 55 INSTRUCTOR Judith Irwin Office 308E Stirling Hall Ph 533 2717 email irwin astro queensu ca WEB PAGE Click from Irwin s home page at http www astro queensu ca irwin SUMMARY This course assumes some basic knowledge of astronomical facts and terminology at the level introduced

    Original URL path: http://www.astro.queensu.ca/~irwin/phy215/y2002/summary.html (2016-02-13)
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  • Phys 215 Outline
    rigorously and that there will be some material presented in class which is not in the text Introduction Size scales mass density forces The telescope e m spectrum and atmospheric windows scintillation seeing extinction reddening reflection refraction diffraction the optical telescope magnification field of view plate scale Radiation solid angle specific intensity flux density luminosity reminder of magnitudes pressure and relations between them example of integration over spherical coordinates in 3 d dependence on distance and examples Radiation Processes The black body spectrum Stefan Boltzmann Law Wein s Law Rayleigh Jeans Law Wein s Displacement Law effective temperature brightness temperature kinetic temperature examples e g planet temperatures The Bohr atom with application to spectral lines in stars summary of other kinds of processes e g continuous monochromatic thermal non thermal Radiative Transfer The equation of radiative transfer absorption coefficient optical depth mean free path concepts of TE and LTE emission and absorption lines example using HI 21 cm line Stellar spectral types understanding change in line strength with temperature and the HR diagram Stellar structure Equations of stellar structure HE Equation of State perfect gas law only plus radiation pressure only mass continuity radiative transport convection conduction mentioned but not

    Original URL path: http://www.astro.queensu.ca/~irwin/phy215/y2002/outline.html (2016-02-13)
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  • Phys 215 Supplementary Notes
    A human being This image shows a false colour view of a human being holding a match at an IR wavelength Again colour represents brightness which varies according to the temperature at different positions on the person e g the glasses are cooler The planets their moons and asteroids Look for example at the moon at mid IR wavelengths Interstellar Dust Each dust grain is an opaque object at a characteristic temperature and will radiate according to the Planck curve Examples of objects emitting a thermal Bremsstrahlung spectrum An ionized hydrogen HII region T about 10 4 K at radio wavelengths 6 cm See her Fig 1 Ionized hydrogen in the Abell 2142 cluster of galaxies T about 10 8 K at X ray wavelengths Examples of objects emitting a synchrotron spectrum The double lobed radio galaxy Cygnus A The edge on galaxy NGC 5775 The blue contours in this image show the radio continuum emission The optical galaxy is roughly where the blue background solid colour is The halo region around the galaxy is due to synchrotron emission whereas the contours towards the middle where the optical galaxy is would be due to a mixture of synchrotron emission and

    Original URL path: http://www.astro.queensu.ca/~irwin/phy215/y2002/notes.html (2016-02-13)
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  • Phys 215 Assignments
    Due Friday February 15 2002 in class Assignment 2 Solutions Page 1 Page 2 Page 3 Page 4 Page 5 Page 6 Page 7 Assignment 3 Due Friday March 8 2002 in class Assignment 3 Solutions Page 1 Page 2 Page 3 Page 4 Page 5 Page 6 Page 7 Page 8 Page 9 Assignment 4 Due Wednesday March 20 2002 in class Assignment 4 Solutions Page 1 Page 2

    Original URL path: http://www.astro.queensu.ca/~irwin/phy215/y2002/assignments.html (2016-02-13)
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  • Phys 215 Project
    and because a research grade CCD camera is attached to it we are now able to observe very faint objects which were previously completely inaccessible This has opened up the possibilities for undergraduate projects at an entirely new level of sophistication Research Instead of simply repeating experiments that have been done before by others the Phy 215 students this year are being asked to participate in real research There are a few possibilities for doing research using a small telescope One which is most likely to have the strongest impact is determining the light curves of asteroids The light curve is a measure of the variation in brightness of the asteroid with time this in turn is related to the asteroid s rotation rate period Although thousands of asteroids are now known only a fraction of them have well determined periods With the whole class participating and making use of all clear nights it should be possible to find the periods of several asteroids during the 2002 winter term Goals The goals are a to familiarize the students with modern techniques in astronomical observations and the care and commitment required to obtain and properly reduce data b to measure the

    Original URL path: http://www.astro.queensu.ca/~irwin/phy215/y2002/project.html (2016-02-13)
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