Electromagnetism, Properties Of Waves, Motion, Gases & The Kinetic Theory Worksheet With Answers Page 30
ADVERTISEMENT
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36Forces within a star.
There are 2 forces at acting inside a star.
1. Inward force of gravity
2.Outward: combination of gas and radiation
pressure.
Gas pressure: caused by rapid random motion of
particles in the sun.
Radiation pressure: caused by light hitting the
particles.
For most of the life of a star it is in a stable
state in which the inward force of gravity on any part of the star is balanced (equal) by a
force due to the increasing pressure towards the centre.
If the pressure in the middle falls, this will cause a star to shrink – this will cause the
pressure to rise once more until a new equilibrium is established with the star smaller. If
the pressure increases, the star will expand.
Main sequence stars.
Main sequence stars fuse hydrogen to helium in their cores.
The colour of a star depends upon the temperature of the star. Our sun is a yellow star
which is one of the most common type. Surface temperature is 5800˚C. Stable lifetime is
around 10,000 million years. The diagram below is a Hertzsprung-Russell diagram.
30
ADVERTISEMENT
0 votes
Related Articles
Related forms
Related Categories
Parent category: Education