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SCI 151 Week 3 Quiz


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SCI 151 Week 3 Quiz

1.We live on what planet?

1.    The relationship between the speed of light, C, wavelength, L , and frequency, F is

2.    The moon is 375,000 Km from Earth. You shine a  
laser with a wavelength of 1 centimeter at the moon. About how long did it take for the light leaving your laser to reach the Moon?  
3.    Radio Waves are  

4.    A star whose spectrum peaks in the Infrared is always

5.    The Hubble Space Telescope obtains higher resolution images than most ground based telescopes because

6.    Solar Brightening is due to

7.    The time it takes energy created inside the Sun’s core through nuclear fusion to eventually leave the Sun as a visible photon is

8.    What causes the 11-year cycle of solar activity?

9.    Select the best statement below regarding the structure of the Sun

10.    A Star converts 10 Million Kilograms of hydrogen each second into energy. The amount of energy this corresponds  is equivalent to a power of

11.    At the Center of the Sun the nuclear fusion process converts hydrogen into

12.    Assume the Sun convertsthrough Hydrogen Fusion about 700 Million tons of Hydrogen each second into Helium, and Energy. How long in years would it take for the Sun to lose the equivalent of one Earth massin Hydrogen?  
*The mass of the Earth = 6 x 1024 Kg. and  1 Ton = 900 Kilograms.

1.The Star Sirius looks brighter than Alpha Centauri, does this mean that Sirius is closer to the Earth than Alpha Centauri. ______
2.The Star Sirius is 8 Light years from earth…. If a star with equivalent luminosity to Sirius was 16 light years from Earth, would it appear ¼ as bright? _____
 3. Blue stars have hotter surface than red stars? ___

14.    An H-R diagram is use for plotting

15.    The Sun is a main sequence Star today. When the Sun becomes a Red giant it will be characterized compared to the Sun today as having  a

16.    Stars form most easily in Molecular clouds that are

17.    What would you most find if you could return to the SUN 10 Billion years

18.    Which Sequence defines the life cycle of a large star of 10 Solar Masses from start to end.

19.    What Method is most often used to measure the distance of star that is within 100 Light Years from Earth

20.    The distance from Earth to the star Betelgeuse is about 430 Light Years. If it were to explode as a supernova it would be the brightest star in the Sky. Right now the brightest star other than the Sun is Sirius with a Luminosity of 26 L sun and a distance of 8.6 Light Years. If Betelgeuse reached a maximum Luminosity of 10 8 L Sun, how much brighter in our sky would the Betelguese Supernova be compared to Sirius.  

21.    Using the Information from above, if this Supernovae were to be observed on planet Mars 50 years from now, what year did the Supernovae actually occur

22.    A Stellar black hole has a mass of 9 M sun. What is the diameter of this Black Hole?

23.    If the Sun suddenly became a Black Hole without changing it’s mass what would happen.

24.    What method is used to determine the chemical composition of stars

25.    What of the following is not responsible for the Aurora Borealis

26.    The Sun gives off most of it’s energy in the Yellow – Green range corresponding to a wavelength of about  5500 Angstroms.  What is the  Frequency that this corresponds to?

27.    The amount of Solar power that reaches the Earth’s Surface on a clear day when the Sun is directly overhead is about

28.    Which statement is False

29.    A Black Hole Can be indirectly detected  by

30.    Explain why massive stars stay on the main sequence for much shorter times than average stars like the sun. (Minimum 100 words)

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