Star Life Cycle
What force starts a star’s life by pulling gas and dust together?
Gravitiy
What two elements are fused in the Sun’s core?
Hydrogen → Helium
What happens to energy when a wave’s amplitude increases?
Energy increases
If particles move up and down while the wave moves forward, what type is it?
Transverse Waves
Where are bright, big, cool stars located on the HR diagram, and what are they called?
Upper right: Supergiants
What happens inside a protostar that makes it become a star?
Nuclear Fusion
What will happen when the Sun runs out of hydrogen?
It will expand into a red giant
If wavelength shortens but speed stays the same, what happens to frequency?
Frequency increases
If particles move back and forth in the same direction as the wave, what type is it?
Longitudinal Waves
Where are small, dim, but hot white stars located, and what are they called?
Lower left; White Dwarfs
Why do massive stars die faster than small ones?
They burn fuel faster
What two things does the HR diagram compare?
Temperature and brightness (luminosity)
What happens when a wave bounces off a surface?
Reflection
What type of wave is sound?
Longitudinal
Where are average, medium stars like our Sun found, and what are they called?
Middle band; Main Sequence
What happens after a massive star goes supernova?
It becomes a neutron star or black hole
What is the longest stage in a star’s life cycle?
Main Sequence
What do waves transfer from place to place?
Energy
What type of wave is light?
Transverse Waves
Where are hot, bright, massive stars located, and what are they called?
Upper left; Blue Giants or Blue Supergiants
Why does a white dwarf stop shining over time?
It runs out of energy and dies
On which axis is temperature shown, and it (decreases/increases) from left to right
X-axis; decreases left to right
Why can’t sound travel through space?
No medium (no matter)
Draw and Label a transverse wave correctly:
- Wavelength, Amplitude, Crest, Trough, Rest line
I will draw
Which 2 groups of stars are found above the main sequence?
Giants and Supergiants