Physics P1 6.5 The Big Bang.

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How did the universe start?
The universe started with the Big Bang; a massive explosion from a very small initial point.
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What has been happening ever since the Big Bang?
The universe has been expanding.
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What electromagnetic radiation was created just after the Big Bang?
Cosmic microwave background radiation (CMBR).
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How can CMBR be explained through?
At present CMBR can only be explained by the Big Bang theory.
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What is CMBR?
Cosmic microwave background radiation.
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What dives us evidence that the universe is expanding outwards in all directions?
Red-shift.
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If the universe is now expanding outwards, what does this suggest?
This suggests that the universe started with a massive explosion at a very small initial point, known as the Big Bang theory.
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What would have been produced if the universe began with a Big Bang?
High energy gamma radiation would have been produced and as the universe expanded this would have become lower-energy radiation.
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What have scientists discovered coming from every direction in space?
Microwaves - cosmic microwave background radiation (CMBR), the radiation produced by the Big Bang.
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How is the existence of CMBR explained?
The Big Bang theory is so far the only way to explain it's existence.
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What is the Big Bang theory?
The theory that the universe began with a massive explosion from a small initial point.
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What happens to the wavelength of radiation as it changes from gamma to microwave?
The wavelength increases.
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**BE SURE THAT YOU CAN EXPLAIN WHY RED-SHIFT IS EVIDENCE FOR AN EXPANDING UNIVERSE AND THE BIG BANG**
**
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Card 2

Front

What has been happening ever since the Big Bang?

Back

The universe has been expanding.

Card 3

Front

What electromagnetic radiation was created just after the Big Bang?

Back

Preview of the front of card 3

Card 4

Front

How can CMBR be explained through?

Back

Preview of the front of card 4

Card 5

Front

What is CMBR?

Back

Preview of the front of card 5
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