The Universe Flashcards

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1
Q

What is the Doppler effect?

A

The change in frequency due to an object moving towards or away from an observer.

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2
Q

What happens to the wave and frequency when a car making noise drives away from someone?

A

The wavelength gets longer and the frequency gets smaller.

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3
Q

What happens when a car making noise drives towards you?

A

The wavelength of sound gets shorter and the frequency gets higher.

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4
Q

What is Red-Shift?

A

Light from far away galaxies that has shifted to the end of the spectrum

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5
Q

Which galaxies are moving fastest?

A

The ones that are furthest away.

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6
Q

How does RS show that the universe is expanding?

A

Further the galaxy away, the more redshifted it is by being expanded.

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7
Q

What is the Big Bang?

A

Evidence to say that the universe has continued to expand from one small point.

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8
Q

What is Cosmic Background Radiation?

A

Where the big bang happened and gamma radiation came out, but has stretched to become microwave radiation.

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9
Q

What is red and blue shift?

A

Red ⬅️ (Galaxy) ➡️ Blue

  • spread out - closer together
  • low frequency - if to come towards us
  • long wavelength
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