{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Lecture09_QM1 - Quantum Theory Quantum 1 1 Topics q...

Info icon This preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Quantum Theory Quantum Theory 1 1
Image of page 1

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

View Full Document Right Arrow Icon
2 Topics Topics Discovery of the Electron Millikan’s Experiment Blackbody Radiation An Act of Desperation Summary
Image of page 2
3 The Discovery of the Electron The Discovery of the Electron 1838 – M. Faraday Discovery of arc light in dilute gas 1857 – H. Geissler Discovery of fluorescence in dilute gas 1880s – W. Crookes Development of cathode ray tube 1895 – J. Perrin Cathode rays found to be negatively charged
Image of page 3

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

View Full Document Right Arrow Icon
4 The Discovery of the Electron The Discovery of the Electron 1896 – P. Zeeman First evidence of atomic particles with a specific charge-to-mass ratio 1897 – J.J. Thomson Measurement of charge-to-mass ratio of cathode ray particles. In effect, this was the discovery of the electron and the dawn of modern physics, in particular, particle physics (also known as high energy physics)
Image of page 4
5 The Discovery of the Electron The Discovery of the Electron C cathode A,B slits D,E deflection plates , / M E F quB F qE u E B = = = q u m RB =
Image of page 5

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

View Full Document Right Arrow Icon
6 The Discovery of the Electron The Discovery of the Electron C cathode A,B slits D,E deflection plates , / M E F quB F qE u E B = = = Thomson found that whatever gas was used he always got the same q / m ratio of about 0.7 x 10 11 C/Kg . The cathode particles were called corpuscles by Thomson and later electrons by Lorentz
Image of page 6
7 Millikan’s Experiment Millikan’s Experiment Millikan began experiments in 1909 He measured e to be e = 1.601 x 10 -19 C Charged oil drops Suspended oil drops
Image of page 7

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

View Full Document Right Arrow Icon
8 Blackbody Radiation Blackbody Radiation Josef Stefan 1835 – 1893 In 1879, Josef Stefan found an empirical formula to describe the power radiated by an ideal black body P = σ Τ 4 σ = 5.6703 x 10 -8 W/m 2 K 4 Five years later, Ludwig Boltzmann was able to derive this formula from thermodynamics
Image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    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.

    Student Picture

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

  • Left Quote Icon

    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.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    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.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern