31.5 - The Expanding Universe Flashcards Preview

Physics - Topic 31 - Cosmology > 31.5 - The Expanding Universe > Flashcards

Flashcards in 31.5 - The Expanding Universe Deck (9)
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1

What do atoms in the outer layers of a star emit?

A continuous spectrum of EM radiation

2

What is Doppler shift?

The distortion of sound waves as the source moves towards or away from you

3

What happens when the source moves towards you?

The frequency increases

4

What else can this be applied to?

EM waves received on Earth from stars

5

What is the link between change in wavelength and the relative velocity of the source and observer?

z = Δλ/λ = v/c

6

What is z?

The size of the redshift

7

What does a negative change in wavelength mean?

The galaxy is moving towards us

8

How are v and d related?

Direct proportion

9

What is the constant of proportionality?

The Hubble Constant