Homework Ch 10-13

1. 76.92 parsecs

3. a) 3.35 x 10^28

4. Star A: 4 x 10^12, Star B: 3.8 x 10^13

8. 316 parsecs

10. The greater the mass, the greater the lifespan.. brighter the star, the shorter it will be.

MAGNITUDE PROBLEMS:

1. How many times brighter is: a 5th magnitude than a 10th magnitude: 100 times.

2. 7th than 17th: 10,000 (10... so 100 x 100)

3. 3rd than 5th: 2.5 x 2.5 = 6.25 times

4. 3rd than 6.5th: 19.5 apprx

5. 12th than 22.5: 125 times

6. What is the magnitude of the star if it is 100 times dimmer than a 12th? 22nd magnitude star

7. 10,000 times brighter than 12th mag: -8 magnitude (-20)