Topic 7

Question 1

redshift

Answer 1

the wavelength of em radiation increases/ decreases as the star moves away from earth

Question 2

CMBR

Answer 2

radiation that comes from all directions of the sky from the big bang explosion

Question 3

heliocentric model was proved by

Answer 3

voyager missions

Question 4

steady state

Answer 4

• matter is continuasky beiang created
• the universe has always existed
• density of matter is constant

Question 5

big bang thoery

Answer 5

• universe started out 13 billion years ago
• all matter started out at a tiny point
• density of matter increases over time

Question 6

both

Answer 6

space is expanding

Question 7

Explain how evidence supports the ideas that the Universe is expanding

Answer 7

red shift, light from distant galaxies/ stars shifts to the red side of the em spectrum observed spectrum of light is longer showing that the source is moving away demonstrating the doppler effect

Question 8

Explain how evidence supports the ideas that the Universe began at a single point

Answer 8

CMBR, microwave radiation left from the beginning, microwaves detected from all over the sky in all directions
the big bang had an initial explosion that releases radiation

Question 9

Suggest two reasons why the gravitational field strength on the Moon is different from the
gravitational field strength on the Earth.

Answer 9

mass, radius, density

Question 10

Describe the process that then occurs to produce the conditions necessary for nuclear
fusion in a new star

Answer 10

nebula collapses under gravity GPE converted into KE VERY high temps and pressures released

Question 11

consept

big band theory

Answer 11

• initial explosion
• from al small point
• the begining of the universe
• evidence for expansio of universe

Question 12

reflecting telescopes

Answer 12

concave mirrors used to focus light onto eyepiece

Question 13

refracting telescopes

Answer 13

uses lenses that bend light onto teh eyepiece

Question 14

eyepice function

Answer 14

magnifies light before it reaches eye

Question 15

r<r

Answer 15

refractor<reflecor
more expensive
chronic apperation
less compact

Question 16

hubble telescope

Answer 16

detects all wavlengths as its out of teh atmosphere (which absorbs wavkengths)

Question 17

Describe the formation of our Sun to main sequence.

Answer 17

gravity (1)
* (causes the) nebula
to collapse/contract
(1)
* (causes the)
temperature to increase

MP1 in a nebula (1)
MP2 (particles) attracted / come
together by (force of)
gravity (1)
MP3 pe/ke transferred to
thermal/heat energy (gas
begins to glow and forms
protostar) (1)
MP4 until {hot / pressure /
dense} enough to start
nuclear reaction /fusion (1)

Question 18

red shift change

Answer 18

(distant) galaxy moving away
(1)
* (so) line shifted to longer λ (1)

Question 19

The next stage in the life cycle of the Sun will be

Answer 19

white dwarf

Question 20

Explain why telescopes that search for planets are not on the Earth’s surface.

Answer 20

• plantes are far
• image of them is distorted
• atmosphere (light pollution) in the way
• can detect parts of EM spectrum that arent detectable on earth

Question 21

A star of much greater mass than the Sun will eventually become

Answer 21

blackhole

Question 22

star no universe guess old

Answer 22

the oldest star had not yet
appeared when the {Big Bang
happened / universe
started}(1)
MP2 the Universe is older than
the oldest star
MP3 star takes time to form (1)
MP4 can’t be certain of this time