Redshift And The Doppler Effect

Question 1

What happens if the object is moving away from you?

Sound

Answer 1

The waves will be stretched out, meaning there will be a longer wavelength and so a lower frequency
> lower pitched sound

Question 2

What happens to light if an object is moving away from you?

Light

Answer 2

> the waves will be more stretched out
longer wavelength
lower frequency
light is red

Question 3

What happens in an object moving towards you? (Light)

Answer 3

> the waves will be more compressed
shorter wavelength
higher frequency
light will appear to be blue

Question 4

What is CMBR?

Answer 4

cosmic microwave background radiation

> when the Big Bang had first happened it was very hot and there was lots of high frequency radiation

> as the universe expanded it cooled, and there is now very low frequency microwave radiation

Question 5

What happens if an object is moving towards you?

Sound

Answer 5

> its sound waves will be compressed,

• decreasing wavelength
• which increases frequency
• the sound will be more high pitched