Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
AS101 Final
key words to know
| Question | Answer |
|---|---|
| absolute luminosity | the total amount of light that an object puts out per second. |
| amplitude | the height of a wave above its undisturbed state. |
| apparent luminosity | the amount of light that an observer sees at their distance from an object. |
| astronomical unit (AU) | the average distance of the Earth from the Sun. |
| cepheid variable | a variable star that cycles from brighter to dimmer and back again with a regular pattern that is related to the stars absolute luminosity. |
| dark matter | material that is difficult to see outside the universe but whose gravitational effects are obvious. EX: black wholes,dust, red dwarfs. |
| doppler effect | observed wavelengths seen by an observer change as the observer moves toward or away from a source of light. toward=shorter away=longer |
| electromagnetism | 1 out of 4 forces in the universe. holds atoms together. produces light in the form of photons |
| electron | a negatively charged particle that orbits the nucleus of an atom. |
| falsified | when the prediction of a hypotheses does NOT match the experimental results |
| flux | the amount of light crossing an observer per second per unit area from some light source |
| frequency | the number of cycles a wave completes per second. |
| Galileo | Italian math professor who used the telescope to show that the heliocentric model was indeed true |
| geocentrism | idea that the earth is the center of the universe and that the sun and the planets orbit the earth. |
| gravity | 1 out of 4 forces. objects with mass attract one another with a force that depends on the inverse of the square of the distance between the two objects |
| heliocentrism | presented by copernicus, that the earth was like the rest of the planets and orbited the sun |
| edwin hubble | american astronomer discovered universe was bigger than the milky way. showed the universe was expanding |
| hubbles law | galaxies that are farther away appear to be moving away from earth faster than galaxies that are closer. |
| hypothesis | an idea of some feature of nature works that also makes a prediction of some testable measurement related to the explanation. |
| johann kepler | german minister who was a mathematician. worked out proof the planets orbit the sun in elliptical orbits. |
| light year | distance light travels in one year |
| isaac newton | english math professor who invented calculus. |
| neutron | neutral particle in the center of an atom. |
| nucleus | center of an atom that contains protons, neutrons. |
| parallax | observation that the apparent position of a distant object changes depending upon where the observer is. |
| parsec | distance required for a star to produce a parallax angle of 1 arc second with the earth have a baseline of 1 AU |
| period | length of time to complete one cycle of a wave |
| photon | a particle of light. all of them have the same speed, but can have different energy, frequency,or wavelength. NO MASS |
| proton | positively charged particle at the center of an atom |
| speed of light | instantaneous speed of light is 3 x 10^8 m/s |
| standard candle | object out in space with a known absolute luminosity. |
| strong force | 1 out of 4 forces. this one holds nuclei of atoms together |
| theory | a well verified hypothesis |
| type 1A supernova | a pair of stars that go through a sequence of dying. first star becomes a white dwarf then draws matter off of the second star. white dwarf explodes |
| type 2 supervova | enormous star that explodes with bright explostion when it dies. mot a standard candle. after the explosion it becomes a neutron star or a stellar sized black hole |
| verified | when a prediction of a hypothesis matches the results |
| wavelength | the physical length of one complete cycle of a wave |
| weak force | 1 out of the 4 forces. responsible for allowing particles to change identity from one type to another. |
Created by:
adrienne.nesbit
Popular Physics sets