Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Physics > Space > Flashcards

Space Flashcards

1
Q

How fast do waves travel in space?

A

The same speed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is red shift?

Doppler Effect

A

Red shift is when the frequency and wavelength of a wave decreases because the source (Galaxy) is moving away. Greater the speed, the greater the red shift

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

The 2 different theories about the universe?

A

The Big Bang theory

The steady state model

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is the Big Bang theory?

A

Density of galaxies falls as the universe expands

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is the Steady State theory?

A

Density of galaxies remains constant as universe expands (space filled by new galaxies)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What evidence is their for steady state?

A

The universe is expanding (red shift)

The universe has no origin/ always existed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is the evidence for Big Bang theory?

A

The universe is expanding (red shift)

The universe has an origin (cosmic microwave background radiation)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What happens in galaxies that are further away from us?

A

They are moving away quicker than if closer

Big Bang theory

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Why do we put telescopes in space?

A

Lots of light pollution on earth
Sharper images as atmosphere/ weather can blur images
Not all EM waves can pass through our atmosphere

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What can we send into space and what can they do?

A

Landers land on a planet and collect soil samples
Rovers rove around a planet, collect soil samples, mapping terrain
Probes fly around the solar system photographing objects and detecting radiation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What do landers, rovers and probes search for?

A

Oxygen and water

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What does SETI stand for?

A

Search for Extra Terrestrial Intelligence

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Explain the life cycle of a BIG star

A

The star starts as a nebula, gravitational potential energy pulls the dust together which forms a main sequence star
A nuclear reaction starts. Particles try to spread out. When the nuclear fuel runs out, it forms a red giant. The star then explodes into a supernova
Which then forms a neutron star and if big enough then forms a black hole

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Explain the life cycle of a SMALL star

A

The star starts as a nebula, gravitational potential energy pulls the dust together which forms a main sequence star
A nuclear reaction starts. Particles try to spread out. When the nuclear fuel is used up, it forms a red giant.
Then it forms a white dwarf, then a black dwarf

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What does the greater the red shift?

A

The greater the red shift, the further away a galaxy is and the faster it is moving away

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What does the greater the red shift?

A

The greater the red shift, the further away a galaxy is and the faster it is moving away

17
Q

State examples of telescopes to observe stars and planets

A 
Radio telescope
Infra red telescope
Ultra Violet telescope
X-Ray telescope
Gamma ray telescope
18
Q

A converging lens refracts light to produce an image of a distant object on a screen.
The image on the screen is….

A

Upside down

19
Q

What is the role of the eyepiece lens?

A

To magnify the image produced by a the objective lens

20
Q

What is the role of the objective lens?

A

Collects light and focuses the light to a point (focal point)

21
Q

Galileo used his telescope to observe the planet Jupiter and its moons.
Explain why Galileo’s observations contradicted the scientific ideas about the solar
system that were most popular at that time.

A

Galileo observed the moons orbiting Jupiter, this contradicted beliefs that everything orbited earth, proving that these beliefs were incorrect

22
Q

What is a planet?

A

A rock that orbits a star

23
Q

What is a moon?

A

A rock that orbits a planet

24
Q

What is a star?

A

A ball of gas made up of hydrogen and helium that gives out light and heat energy

25
Q

What is a solar system?

A

A collection of planets that orbits a star

26
Q

What does an upside down image mean about the image?

A

The image is real

27
Q

What is a galaxy?

A

A collection of stars going round a black hole

28
Q

What does a positive and negative sign mean in terms of magnifications?

A

The positive sign means image is real, upside down

The negative sign means image is virtual, upright

29
Q

Who proposed the geocentric model?

A

Ptolemy

30
Q

What is a universe?

A

All the galaxies and stars and planets

A collection of galaxies

30
Q

Who proposed the heliocentric model?

A

Nicolaus Corpernicus

31
Q

State two advantages of using a camera , rather than the unaided eye, for studying stars.

A

You can look at the images later/ any time

Some lenses on cameras have varied focal lengths so can zoom into object

32
Q

Who found evidence for the heliocentric model?

A

Galileo

33
Q

What does an upright image mean about the image?

A

The image is virtual

34
Q

Why do we see stars?

A

They give out light

35
Q

Why do black lines appear in spectra?

A

Those wavelengths have been absorbed

36
Q

What do s red shift provide evidence for?

A

The universe is expanding

Physics (6 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions