Unit 11: Star and the Universe

Which two elements are the most commonly found in the Sun?

• Hydrogen and oxygen

• Helium and carbon

• Hydrogen and helium

• Nitrogen and oxygen

Light from distant galaxies appears red-shifted to observers on Earth.

Which of the following ideas does this provide evidence for?

1. The Big Bang Theory

2. The Universe is expanding

3. Distant Galaxies are moving both towards and away from us

• 1 only

• 1 and 2

• 2 only

• 1, 2 & 3

Which part of the electromagnetic spectrum does the Sun radiate most of its energy?

• radio, visible and gamma

• infrared, visible and ultraviolet

• infrared, X-rays and gamma

• infrared, visible and gamma

• A

• B

• C

• D

Which is the best description of redshift?

• Distant galaxies only emit light from the red of the spectrum

• Only red light can reach Earth from very distant stars

• Stars in the Milky Way mostly emit light at the red end of the spectrum

• The light received from distant galaxies is moved towards the red end of the spectrum

How many years would it take light to travel from the centre of the Milky Way to the outer edge?

• 500 years

• 50 000 years

• 100 000 years

• 100 000 light years

• A

• B

• C

• D

Which of the following equations represents the age of the Universe?

• t

• Ho

• v/ d

• d/ v

Which is the correct value of one light year?

• 9.5 x 10^15 km

• 9.5 x 10^15 m

• 9.5 x 10^15 s

• 9.5 x 10^15 days

The planet Uranus has an average orbital radius of 4 500 million km. How long does it take light from the Sun to travel to Uranus?

• 4 minutes

• 1 hour

• 4 hours

• 4 days