Quiz review

Quiz:

Questions about:

1.  H-R diagram.

- know what it means

- the axes and general shape

- the Main Sequence

- where to find white dwarfs and giants/supergiants

- the stellar classification (O B A F G K M)

- what kind of star the Sun is (G2)

I may just draw an H-R diagram and ask you to fill in information.

2.  Doppler effect

- understand the general nature of the DE, not just for sound but also for light (it's all about an apparent change in the frequency)

- know the difference between red shift and blue shift

- know that the red shift of distant galaxies suggested to Edwin Hubble that the universe was expanding

3.  Basics of optics

- how light behaves when it hits a mirror or lens
- be able to draw paths that light would take

4.  Revisit the parsec and recall the definition.

- at a distance of 1 parsec, a length of one AU subtends an angle of one arcsecond.  It also works in reverse - if the Earth travels a distance of 1 AU in orbit, the parallax angle of nearby stars (with respect to further-away background stars) can be used to measure their distances:

d = 1/angle

where d (distance, in parsec) is 1 divided by the parallax angle (in arcseconds).

5.  Electromagnetic radiation

Know a little about the EM spectrum chart:

- it goes from low frequency waves to high frequency waves

- you can also think of it as going from long wavelength to short wavelength waves

- Radio, microwave, IR, visible, UV, X, gamma

- ALL of the waves travel at the speed of light (c) in a vacuum.  

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