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46 Cards in this Set
- Front
- Back
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A light year is:
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3.0 x 10 m/s
or the distance light travels in a year |
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the three types of galaxies and their relative shapes are:
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--spiral
--elliptical --irregular |
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What theory states that the universe began with a gigantic explosion?
How many years ago was that explosion? |
Big Bang
13.75 billion years ago (teachers answer is ~13.5 billion years ago) |
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If a star is 6 light years away, then how many meters away is the star? (1 LY=9.5 x 10 m)
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5.67631704 x 10
Dude: I wrote the above from your sheet. You HAVE to show your work or the teacher will mark it wrong!! |
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What solar system is what galaxy?
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Milkyway Galaxy
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Clusters of galaxies can form larger groups called what?
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superclusters
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A red shift suggests that the universe is what?
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very far away
(Your teachers answer is "EXPANDING") ~I'd go with your teachers answer |
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Light travels at how many m/s?
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3.0 x 10
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Explain why light travels fastest in a vacuum and not in a solid.
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The solids disrupt its vibration or reflect some of it.
(Your teacher's answer is "because light energy is absorbed and reemitted) |
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Draw a diagram of a wave and label the midpoint, cret, trough, wavelength and amplitude.
THEN, explain whay type of wave is this. |
sine/transverse wave
draw wave: |
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List the colors of visible light in order of increasing energy:
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ROY G BIV
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The dual nature of light means that it can be studied as _______ or __________.
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waves
or particles |
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What are max planck also called?
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photons
(not really sure if this is accurate, look at question 12 on the study guide--mom) |
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write the proportion that relates light intensity and distance:
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the closer the thing the greater the intensity
(Harrison --your teacher wants the actual formula) |
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If distance to a light source triples then intensity __________ by _________.
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decreases
1 _ 9 |
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the equation that relates f and T is:
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F= 1/T
T= 1/F |
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the equation that relates f and T is:
If T = 3s, then f= if T = 5.2s, the f = |
0.3 Hz
.19 Hz (don't forget the Hz!) |
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As period increases, f ________. This means they have a(n) _______ relationship.
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decreases
inverse |
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Make a wave diagram with a high frequency and a short wavelength.
label which has high/low energy and long/short period |
draw wave diagram
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Make a wave diagram with a low frequency and a long wavelength.
label which has high/low energy and long/short period |
draw wave diagram
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On the EM spectrum, which type of wave has the longest wavelength
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TV/radio
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On the EM Spectrum, which type of wave has the shortest wavelength?
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gamma
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the temperature of a star can be estimated based on the star's _____.
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color
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______ has the longest wavelength.
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red
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________ has the shortest wavelength
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violet
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What forces hold stars together?
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gravitational
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Birth order of star: put in order...
when 15 million Kelvin is reached, fusion starts |
4
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Birth order of star: put in order...
a cloud of gas and dust collapses because of its own gravity |
1
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Birth order of star: put in order...
the temperature increases |
3
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Birth order of star: put in order...
the star reaches equilibrium when the release of energy equals the force of gravity |
6
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Birth order of star: put in order...
it begins to spin, gets smaller and spins faster |
2
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Birth order of star: put in order...
this process converts hydrogen into helium |
5
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Supergiant stars continue fusion until what happens?
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Until Fe/iron nuclei form in the core
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The layer of the sun that we see is the what?
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the photosphere
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During a solar eclipse, the white layer of the sun that we see is the what?
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the corona
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Fill in the blanks in the flowchart of a star's life cycle:
Birth of a star ---> stable star RED Giant beginning |
Red Giant ---> white dwarf ---> black dwarf
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Fill in the blanks in the flowchart of a star's life cycle:
Birth of a star ---> stable star SUPER Giant beginning |
Super Giant ---> super nova ---->
becomes either a neutronstar or black hole |
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v
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term: speed
unit: m/s |
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c
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term: speed of light
unit: m/s |
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(upside down v thingy)
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term: wavelength
unit: m |
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T
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term: period
unit: s |
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f
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term: frequency
unit: Hz |
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E
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term: energy
unit: J |
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h
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term: Planck's constant
unit: J/Hz or J-s |
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P
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term: power
unit: W |
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I
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term: intensity
unit: W/m |
