Physics 1 - Extra

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What is the Doppler effect ?
The Doppler effect (or the Doppler shift) is the change in frequency of a wave for an observer moving relative to its source.
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What is red-shift ?
When an object moves away from an observer, its light is affected by the Doppler effect. Redshift and blueshift describe how light changes as objects in space (such as stars or galaxies) move closer or farther away from us.
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What is CMBR ?
Scientists discovered that there are microwaves coming from every direction in space: this is called the cosmic microwave background radiation, or CMBR for short. The CMBR comes from radiation created at the beginning of the universe. The Big Bang th
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Evidence: The light from other galaxies is red-shifted.
Interpretation: The other galaxies are moving away from us.
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Evidence: The further away a galaxy is, the more its light is red-shifted.
Interpretation: The most likely explanation is that the whole universe is expanding. This supports the theory that the start of the universe could have been from a single explosion.
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Evidence: The Cosmic Microwave Background Radiation, CMBR, exists.
Interpretation :The relatively uniform background radiation is the remains of energy created just after the Big Bang.
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Card 2

Front

What is red-shift ?

Back

When an object moves away from an observer, its light is affected by the Doppler effect. Redshift and blueshift describe how light changes as objects in space (such as stars or galaxies) move closer or farther away from us.

Card 3

Front

What is CMBR ?

Back

Preview of the front of card 3

Card 4

Front

Evidence: The light from other galaxies is red-shifted.

Back

Preview of the front of card 4

Card 5

Front

Evidence: The further away a galaxy is, the more its light is red-shifted.

Back

Preview of the front of card 5
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