The doppler effect and red shift
- Created by: jaaaz_v
- Created on: 12-06-15 09:40
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- The Doppler effect
- Red shift
- To change the colour of an object, you change the wavelength of the light that's coming from it
- Happens with stars and galaxies
- Stars are often moving away from us and away from each other
- When a star is moving away, the light waves coming off it become more stretched out
- Shifting the rays to the red part of the spectrum
- Making it seem more red
- If an star were to move towards you, the light waves would become more squashed
- Shifting it to the blue part of the spectrum
- Making it appear to be blue
- Used as evidence for the theory of how the earth began
- More distant galaxies have greater red-shifts than nearer ones
- More distant galaxies are moving away from us faster than nearer ones
- Provides evidence that the whole universe is expanding
- More distant galaxies are moving away from us faster than nearer ones
- More distant galaxies have greater red-shifts than nearer ones
- Light waves
- Sound waves are longitudinal
- When a car is moving towards you, the waves in front of it compress
- Get "squashed" together
- This makes the wavelength get shorter
- So the frequency gets higher
- So the pitch goes up
- So the frequency gets higher
- If a car is moving away then the sound waves spread out
- Making the wavelength seem longer
- So the frequency gets lower
- So the pitch goes down
- So the frequency gets lower
- Making the wavelength seem longer
- Both light and sound waves
- Red shift
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