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Red Shift

Doppler effect, red shift, Hubbles Law - for P1.7 GCSE Physics.

Carl Bater

on 28 April 2016

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Transcript of Red Shift

Spot The Difference...
The Doppler Effect
If an object that is producing waves is in motion, it distorts those waves. If it moves towards you, the waves it produces will be compressed (higher frequency). If it moves away, the waves will be stretched (lower frequency).
What has this got to do with Galaxies?
Galaxies emit light, which is a wave... and as you have seen, the light from them is distorted...

If the light from distant Galaxies is being stretched, then
they must be moving away from us at high speeds
The Clever Bit...
Edwin Hubble measured the distance a galaxy was away from us, and worked out their speeds from their red shifts. He plotted these as a graph and noticed something quite important. Time for your task...
Plot distance on the x-axis, velocity on the y-axis, and offer a conclusion...
The further a Galaxy is away from us, the faster it appears to be moving.

We know this as the light from them is stretched out (red shifted).
All galaxies in the observable universe are moving away from each other.
The Expanding Universe...
Full transcript