Flashcards in 31.5 - The Expanding Universe Deck (9)
What do atoms in the outer layers of a star emit?
A continuous spectrum of EM radiation
What is Doppler shift?
The distortion of sound waves as the source moves towards or away from you
What happens when the source moves towards you?
The frequency increases
What else can this be applied to?
EM waves received on Earth from stars
What is the link between change in wavelength and the relative velocity of the source and observer?
z = Δλ/λ = v/c
What is z?
The size of the redshift
What does a negative change in wavelength mean?
The galaxy is moving towards us
How are v and d related?