PHY 232 Spring 2003 Prof. S. Billinge Class 17. PHY 232 Spring 2003 Prof. S. Billinge Announcements Exam 2 Class average = 67% Results here on paper Homework.

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PHY 232 Spring 2003 Prof. S. Billinge Class 17

PHY 232 Spring 2003 Prof. S. Billinge Announcements Exam 2 Class average = 67% Results here on paper Homework Set #7 due on October 28 th Sorry for late posting of set #6, hope to have it under control before next exam

PHY 232 Spring 2003 Prof. S. Billinge Concepts Electromagnetic (EM) waves Properties of EM waves Speed of waves Power transmitted Electromagnetic spectrum

PHY 232 Spring 2003 Prof. S. Billinge The earth is heating up because: 1.Greenhouse gases act like a blanket and keep it warm 2.More energy is arriving from the sun during the day than leaving at night 3.Earth is lower temperature than the sun so radiates energy at longer wavelenths 4.Mankind is irresponsibly returning the atmosphere to primordial compositions before the time of animals

PHY 232 Spring 2003 Prof. S. Billinge Radio telescopes detect radio waves from outer space. The radio waves: 1.Come from alien radio stations 2.Come from exploding stars 3.Sound pretty bad when you play them on your radio

The earth is heating up because: 1.Greenhouse gases act like a blanket and keep it warm 2.More energy is arriving from the sun during the day than leaving at night 3.Earth is lower temperature than the sun so radiates energy at longer wavelenths 4.Mankind is irresponsibly returning the atmosphere to primordial compositions before the time of animals You decide to steal electricity from the electric company inductively. You should: 1.Tape a coil flat against the mains line (and hire a lawyer) 2.Tape a coil perpendicular to the mains line (and hire a lawyer) 3.Wind a coil around the mains line (and hire a lawyer) 4.Forget it, pay your electric bill instead of the lawyer

PHY 232 Spring 2003 Prof. S. Billinge Feedback quiz Split into groups of 2-3. Answer the following questions on paper and hand in on leaving. This can be done anonymously: 1.On a scale of 1-5 (5 is good) how would you rate the helpfulness to your learning of (1)helproom (2)exam review sessions (3)textbook (4)lectures 2.Suggest a constructive change that could be made to any or all of these resources to make them more useful