The Redshift, Hubble’s Law and the Expansion of the Universe.


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Paper for 8 points.

The Redshift, Hubble’s Law and the Expansion of the Universe.

A- Briefly discuss the concept of “redshift” and its application to determine the speed of resection of stars and galaxies.

As an example determine the speed of resection of the galaxy whose emission spectrum is shown below.

B- Discuss the work done by Edwin Hubble. ( observations, and the law that he discovered)

C- The following table gives the distance and the recession speed of some galaxies.

Speed of Recession Km/s

Distance( Mpc)

2500

35

5000

72

8000

118

10000

142

13000

180

17000

254

22000

312

30000

426

35000

485

39000

550

45000

652

1-Graph the data given in the table using two perpendicular axis. Horizontal axis:  distance  in Mpc Vertical axis:  Speed of recession in Km/s.

2- Calculate the slope of the graph plotted in C1. [This slope is known as the Hubble constant H0]

D- The graph given below shows the relationship between the speed of recession and distance of  supernova Type Ia found in other galaxies.

Use the graph to calculate the value of Hubble’s constant. Compare this value with the value you obtained in C2. (COMMENT YOUR RESULTS)

D- Hubble’s constant is used to estimate the age of the universe. Use the value of H0 that you found C2 to estimate the age of the universe.

F. Why is it important to know the true value of the Hubble’s constant?

Rubric.

-Format and Length of Work.

MLS or APS .  Eight  pages (minimum) double space .(Times New Roman font 11.)

Grading.

Excellent or 8 points : The different points outlined above are clearly stated. The calculated values are accurate.

Acceptable  (4 points)

The different points outlined above are clearly stated but some basic information is missing. The calculated values are not accurate.

Poor: (2 points).

The different points outlined above are confused and basic information is missing. The calculated values are not correct.

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