l23 - Today Announcements: HW#10 is due April 9 at 8:00 am....

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ISP209s8 Lecture 21 -1- Today • Announcements: – HW#10 is due April 9 at 8:00 am. – The Spring Break Story Winner is …2,1,4 • What is matter? What is mass?
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ISP209s8 Lecture 21 -2- Standard Model • The fundamental theory of nature’s constituents and their interaction is called the Standard Model • The theory includes: – Strong interactions due to the color charges of quarks and gluons. – A combined theory of weak (weak charge) and electromagnetic interaction (charge), known as electroweak theory. • The theory does not include the effects of gravity. Gravity is tiny compared to the other forces and can be neglected in describing atoms.
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ISP209s8 Lecture 21 -3- What is matter • Matter is the collection of objects made of baryons and leptons. • Objects have quantum numbers that describe their nature Electron: Charge, lepton number, baryon number, etc. Electrons also have mass. What is mass?
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ISP209s8 Lecture 21 -4- Four Fundamental Forces Force Particles Strength Range Mediator Gravity All 6E-39 Infinite Graviton Weak All 1E-5 1E-17 m W ± , Z 0 Electro- Charged 1/137 Infinite Photon magnetic Particles Strong Hadrons 1 1E-15 m Gluon (protons and neutrons)
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ISP209s8 Lecture 21 -5- Standard Model Particles Charge +2/3 -1/3 Anti- particles have the opposite charge.
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ISP209s8 Lecture 21 -6- Quantum Numbers (1) • The structure of the periodic table arises from the underlying quantum numbers. The row gives the principle quantum number. n = 1 n = 2 n = 3 n = 4 n = 5 n = 7 n = 6
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ISP209s8 Lecture 21 -7- Quantum Numbers (2) • Names like top, charm, strange, color, etc. do not mean the same things they do in everyday
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l23 - Today Announcements: HW#10 is due April 9 at 8:00 am....

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