2.6- Nuclear Fission/ Fusion Flashcards
1
Q
What’s the most common fissionable substance?
A
Uranium- 235
2
Q
Nuclear fusion
A
Two atomic nuclei combining to make a large nucleus which causes an energy release
3
Q
Nuclear fission
A
Uranium atoms are hit by neutrons to form a radioactive nucleus, more neutrons and energy… CHAIN REACTION
4
Q
How do stars form?
A
Gas and dust is pulled together because of gravitational attraction
5
Q
Why is the main sequence of a star stable?
A
Forces are balanced
6
Q
How is energy released in stars?
A
Nuclear fusion
7
Q
Sequence of smaller stars
A
>protostar >main sequence >red giant >white dwarf >black dwarf
8
Q
Sequence of huge stars
A
>protostar >main sequence >red SUPER giant >supernova >neutron star/ black hole
9
Q
How did all of the naturally occurring elements come about?
A
Fusion in stars, they are then distributed by the supernova, the big explosion at the end of a stars life
10
Q
What elements are formed after a supernova?
A
Elements heavier than iron
