Redshift Flashcards
1
Q
Why does light waves travelling across space become stretched?
A
space expands
2
Q
What is an example of the doppler effect?
A
redshift
3
Q
What is redshift?
A
Light from stars or galaxies that are moving away from us shifted to longer (more red) wavelength
4
Q
What is blueshift?
A
Light from stars or galaxies that are moving towards us shifted to shorter (more blue) wavelength
5
Q
How to study shift in wavelength?
A
absorption spectrum lines
6
Q
What is the observed wavelength?
A
observed wavelength of light from the star measured in m
7
Q
What is the rest wavelength?
A
wavelength of light emitted by star in m
8
Q
Negative redshift?
A
blueshift
