P2.6 Fission And Fusion Flashcards
1
Q
What is fission?
A
Neutron and uranium nucleus
Goes to smaller nuclei and neutrons
2
Q
How is fission a chain reaction?
A
To makes neutrons which continue to react
3
Q
What’s fusion?
A
Star cycle
4
Q
How is a start formed?
A
Clouds of gas and dust collapse under its own gravitational force and the pressure starts fusion
5
Q
What happens during main sequence?
A
Two hydrogens make helium and continue to make elements to iron
Energy released is equal tithe inward gravitational force
6
Q
What happens to low mass starts?
A
Core collapses Outer layers expand Outer layers are lost Leaving a white dwarf Core cools Leaving a black dwarf
7
Q
What happens to high mass stars?
A
Core collapses Outer layers expand Core continues to collapse Star explodes- supernova Turns to a neutron star or black hole depending on mass
8
Q
Why can’t fusion be done on earth?
A
Need very high temperatures as two hydrogens repel each other
But it would give a lot of energy
9
Q
What is used for fission?
A
Uranium 235
Platinum 239
