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PHYSICS > P1.3 > Flashcards

P1.3 Flashcards

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0
Q

Moon diameter (KM)

A

3 500

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1
Q

Earths diameter?(KM)

A

13 000

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2
Q

Sun diameter (KM)

A

1 400 000

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3
Q

Neptune diameter (KM)

A

50 000

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4
Q

Milky Way diameter (KM)

A

1.0 x 10^18

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5
Q

Andromeda diameter (KM)

A

1.4 x 10^18

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6
Q

Moon distance from Earth

A

384,000km

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7
Q

Sun distance from Earth

A

150,000,000 km

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8
Q

Neptune distance from Earth

A

4,500,000,000km

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9
Q

Andromeda distance from Earth

A

2.5 x 10^14

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10
Q

What methods are used to investigate the existence of alien life

A

Space probes

Soil experiments by landers

SETI (search for extraterrestrial intelligence) ; analyse radio waves from space .

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11
Q

what is the steady state theory and what evidence is there to support it

A

The universe has always existed and is expanding. New matter is continuously created as the universe expands

Red shift

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12
Q

What is observed when a wave source is moving away?

A 
Red shift 
(Longer wave length, shorter frequency)
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13
Q

What is the solar system part of

A

The Milky Way Galaxy

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14
Q

What is a Galaxy

A

A collection of stars

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15
Q

Why are some telescopes located outside the Earths atmosphere ?

A

Because light waves are not reflected by clouds/dust

The atmosphere gets in the way as it absorbs a lot of light coming from space before it can reach us.

16
Q

What do planets reflect?

A

Planets reflect sunlight

17
Q

What do all planets orbit around

A

Stars

18
Q

What is the smallest planet

A

Mercury

19
Q

What are the dark lines called in a spectrometer?

A

Absorption spectra.

20
Q

What’s causes an absorption spectra?

A

They are caused by light at those wavelengths being absorbed e.g. By elements in the star’s atmosphere

21
Q

What are the bright lines in a spectrometer?

A

Emission spectra

22
Q

What causes emission spectra

A

Emission spectra is caused by extra light being emitted at those wavelengths

23
Q

What provides proof that the universe is expanding?

A

Red shift

24
Q

Which is the only theory that provides an explanation for CMB radiation?

A

Big Bang

PHYSICS (3 decks)

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