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P2 > P2.6 > Flashcards

P2.6 Flashcards

1
Q

What happens during the process of nuclear fission

A

The atomic nuclei splits

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2
Q

What can the energy released in nuclear fission be used for

A

To heat water and turn it into steam

Drives turbine which is connected to a generator and generates electricity

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3
Q

What is nuclear fusion

A

The joining together of atomic nuclei and is the process by which energy is released in stars

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4
Q

What are the two fissionable substances used in nuclear fission

A

Uranium-235 and plutonium-239

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5
Q

What is the majority of nuclear reactors used

A

Uranium-235

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6
Q

What is nuclear fission

A

The splitting of an atomic nucleus

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7
Q

What must happen for nuclear fission to occur

A

The uranium-235 or plutonium-239 nucleus must first absorb a neutron

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8
Q

What happens to a nucleus undergoing nuclear fission

A

It splits into two smaller nuclei and two or three neutrons and energy is released

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9
Q

In nuclear fission what might the neutrons start

A

A chain reaction

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10
Q

When do stars form

A

When enough dust and gas from space is pulled together by gravitational attraction

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11
Q

What can also happen when stars are forming

A

Smaller masses may also form and be attracted by a larger mass to become planets

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12
Q

What is a star during the main sequence period of a stars lifecycle

A

A star is stable because the forces within it are balanced

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13
Q

What does a star go through

A

A life cycle

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14
Q

What is the lifestyle of a star determined by

A

The size of the star

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15
Q

What is the lifecycle of a star the same size as the sun

A 
Protostar 
Main sequence star 
Red giant 
White dwarf
Black dwarf
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16
Q

What is the lifecycle of a star much bigger than a star

A 
Protostar 
Main sequence star 
Red super giant 
Supernova
Neutron star or black hole
17
Q

What do fusion processes in stars produce

A

All of the naturally occurring elements

18
Q

How are the natural occurring elements distributed throughout the universe

A

Explosion of a supernova at the end of its life

19
Q

When are elements up to iron formed

A

During the stable period of a star

20
Q

How are elements heavier than iron are formed

A

In a supernova

P2 (6 decks)

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