31.1 - How Stars Begin Flashcards Preview

Physics - Topic 31 - Cosmology > 31.1 - How Stars Begin > Flashcards

Flashcards in 31.1 - How Stars Begin Deck (6)
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1

What are the energy transfers as a cloud of gas becomes a star?

Gravitational potential energy -> Random kinetic energy -> Nuclear energy -> EM wave energy

2

What happens as the kinetic energy of the gas particles increases?

They collide more

3

What happens when the temperature and pressure within a star reach a critical point?

Nuclear fusion begins

4

What does this do?

Releases an outward force to stabilise the star against its own gravity

5

What nuclei are involved in the first steps of nuclear fusion within a star?

Hydrogen nuclei

6

How do the hydrogen nuclei fuse to form a helium nucleus?

2 hydrogen-1 fuse to form hydrogen-2, positron and electron neutrino
Hydrogen-2 and hydrogen-1 fuse to form helium-3 and gamma waves
Two helium-3 fuse to form helium-4 and 2 hydrogen nuclei