Quiz on Chapters 2 and 10


1.  How fast does light travel?
     A.  1,000,000 km/s
     B.  300,000 km/s
     C.  555,000 km/s
     D.  75,000 km/s


2.  What is a frequency?
   A.  The most typical kind of wavelength.
   B.  The Crests of a wave.
   C.  Total number of vibrations per unit time.
   D.  Both B and C.
   E.  None of the above.


3.  True or False: Gamma rays are the most dangerous form of radiation?


4.  What is luminosity?
    A.  How bright a star is.
    B.  The total amount of a star's energy.
    C.  The rate of electromagnetic radiation that is produced by a star.
    D.  All of the above.


5.  Which radiation is visible?
    A.  Infrared.
    B.  Ultraviolet.
    C.  Gamma.
    D.  All of the above.
    E.  None of the above.


6. True or False: When viewing through an eyepiece lens, you see things upside down?


7.  Which star is hotter, a red star or a blue star?


8.   What are spectral classes?


9.    What is the sequence of spectral classes, from hottest to coolest?
    A.  MKGFABO
    B.  ABFGKMO
    C.  OBAFGMK
    D.  OMKGFBA


10.  How can a star's distance be determined?


Key:
1.  B
2.  D
3.  True 
4.  D
5.  A
6.  True
7.  Blue star.
8.  Stars that are classified by the appearance of their spectra..  
9.  C
10.  By comparing both its brightness and luminosity.