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— | astro300_f14:demoshandout [2014/09/16 00:04] (current) – created a_lee | ||
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+ | ===== Demos ===== | ||
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+ | * Demo basics: | ||
+ | * Demos are a great addition to a standard/ | ||
+ | * Sometimes they actually do help elucidate concepts and students like doing " | ||
+ | * As always, the EBRB is a great resource and has a page devoted to [[private: | ||
+ | * In addition, on a given topic' | ||
+ | |||
+ | * What makes a good demo? | ||
+ | * Illustrating difficult physical concept(s) | ||
+ | * Interactive: | ||
+ | * A springboard to new topics | ||
+ | * Straightforward: | ||
+ | * Demo actually illustrates concept in question | ||
+ | |||
+ | * When demos go wrong: | ||
+ | * Demos **can and sometimes do** FAIL! | ||
+ | * Sometimes, especially in astronomy, they can confuse students more than help them or oversimplify a concept. | ||
+ | * Materials may be missing or broken, so CHECK IN ADVANCE! | ||
+ | |||
+ | * Some of our favorite demos: | ||
+ | * Remind everyone that most are written up in the EBRB and on the Resources handout (and wiki page) | ||
+ | - Arc lamps: Put high voltage through tubes of gas and look through diffraction gratings to see spectral lines. | ||
+ | * Head GSIs will train GSIs, Ask Ay375 instructors if you need help. | ||
+ | * Students like this one | ||
+ | * Make sure the stuff is there if your section is early in the day. | ||
+ | * Test it yourself and make sure you can see lines so you can help your students better. | ||
+ | - Warping of Spacetime: A 2D analogy using stretchy black fabric and balls/ | ||
+ | - Celestial sphere, phases of the moon, seasons, orbits: Styrofoam balls, a lamp or flashlight, people getting up and moving around. | ||
+ | - Retrograde motion //(Discuss pitfalls)// | ||
+ | - Day & night on Earth (circle up around a lamp and groups of 3) | ||
+ | - Lunar phases (balls on a sticks around a lamp and groups of 3) | ||
+ | - Seasons (circle up around a lamp) | ||
+ | - Lunar rotation and orbit (//i.e.// tidal locking) (one person orbits another with the Moon's arms outstretched) | ||
+ | - Parallax with your finger (very simple, “close one eye then the other” kind of thing) | ||
+ | - Doppler shift of sound (whirling a buzzer on a string) | ||
+ | - Class H-R diagram | ||
+ | - Stating in words, stating in math, drawing, and acting out Kepler' | ||
+ | - Donut/bagel on a string (though I'm sure profs will do it in class) | ||
+ | - Jumping on a chair with balls being thrown (though I'm sure profs will do it in class) | ||
+ | - (Rayleigh) Scattering of Light: Fill a fish tank with water and a couple drops of milk and shine a flashlight through it to show scattering of blue light and transmission of red light. On the EBRB [[private: | ||
+ | - Planetary Nebulae (and Limb Brightening and Optical Depth): use a Hoberman sphere covered in Christmas lights to show how spherical radiating clouds can appear ring-like. | ||
+ | * Physics has some, but it's kind of a pain to check them out, but some are good for section and some are good for full lecture. | ||
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