| Homework #5 |
|
|
|
|
|
|
|
|
|
|
|
| • | Q7 1
kg of H fused into He. How much
energy is |
|||||||||
| liberated? Use E = mc2, but must
determine how |
||||||||||
| much
mass is converted. We learned in
class that |
||||||||||
| 4.3 10-12 J released for each He
produced. He |
||||||||||
| masses
6.645 10-27 kg, so we have 1.5x1026 He |
||||||||||
| in a
kg, each producing the above energy. |
||||||||||
| Multiply
the energy per He times number of He = |
||||||||||
| 1.5x1026 x 4.3 10-12 J = 6.4x1014
J |
||||||||||
| • | Q9 Sunspot brightness, use E = σT4 |
|||||||||
| • | (T1/T2)4 = (5800/4200)4 = 3.6 times
brighter |
|||||||||
