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Waves - The Expanding Universe
Find out what types of radiation are emitted by the Sun in this quiz.

Waves - The Expanding Universe

This Physics quiz is called 'Waves - The Expanding Universe' and it has been written by teachers to help you if you are studying the subject at senior high school. Playing educational quizzes is one of the most efficienct ways to learn if you are in the 11th or 12th grade - aged 16 to 18.

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The universe in which we live is a puzzling and unimaginably large place. It has been in existence for an incredibly long time and we humans are only able to observe it from a single point in space and time which makes it extremely difficult to understand and explain. It would be a bit like an intelligent microbe trying to work out the detailed structure of the human body from a single point inside of a bone! Cosmology is the name given to the study of the origin and nature of the universe and there have been many theories developed, ranging from creation by an all-powerful being to the currently accepted scientific explanation we call the Big Bang.

1 .
"In space no one can hear you scream" was a famous movie quote, but is that actually true and why?
It is not true
It is true. Sound waves need particles to vibrate to travel. In space, particles are few and far between so sound cannot travel through space
It is not true, but we don't know why
It is true. Space is too cold for sound waves to travel
Sound is a longitudinal wave and requires a material medium so you could not hear a scream directly in space. Electromagnetic radiation can travel through a vacuum so if the person screaming had their communications radio switched on, you would be able to hear their scream. Assuming the spacesuit of the person screaming was still pressurized, if you touched your helmet to theirs, you could hear them scream. But how would that work? And would you really want to be that close ... it could be your turn next!
2 .
If scientists find new evidence that doesn’t support the Big Bang Theory, what should other scientists do?
Have a party
Ignore the evidence and keep on believing what they always have
Dismiss them as crackpots
Test the evidence to ensure that it is reproducible
This is the scientific method
3 .
How long does it take the light from the sun to reach us?
Instantly
2 minutes
8 minutes
20 minutes
Due to the distance between us and the Sun and the fact that light travels at 3 x 108 m/s, it takes around 8 minutes for the light emitted by the Sun to reach us
4 .
How do we know that the Universe is currently expanding?
Light waves from distant galaxies are shifted so that they appear redder than they normally would
Light waves from distant galaxies are shifted so that they appear bluer than they normally would
Gamma waves from distant galaxies are shifted so that they appear redder than they normally would
Delta waves from distant galaxies are shifted so that they appear redder than they normally would
When an object moves away from an observer, the waves that the object emits have a longer wavelength due to the speed of the object. Using this fact we can see that distant objects are moving away
5 .
What is blueshift?
When blue light is emitted from a source
When an object is moving towards an observer, the light emitted from the object is shifted to the blue part of the spectrum
When an object is moving towards an observer, the light emitted from the object is shifted to the red part of the spectrum
There is no such thing as blue shift
Each new wave is emitted from a point a little closer than if the object was stationary so the wavelength appears to be shorter than it would have been
6 .
What happens to the wavelength of light from stars that are moving away from us?
It gets shorter
It doesn't change
It gets longer
It goes zig zag
Each successive light wave crest or trough starts from a little further away than it would have done if the star was stationary so the wavelength is a little longer
7 .
What types of radiation are emitted by the Sun?
Infra-Red
Ultra-Violet
Light
All of the above
The Sun emits many kinds of radiation - not just the light that we can see. We can look at the Sun with special telescopes designed to see different wavelengths of light
8 .
The shift seen when an object is moving towards us is not red, it is …
pink
blue
green
black
The faster the object is approaching, the greater the blueshift
9 .
How do we know black holes exist if we cannot see them?
They bend light
They emit a very specific type of radiation
Objects near them orbit around them
All of the above
The idea of black holes was first suggested in 1916 by a scientist called Scwarzchild
10 .
The faster a star or galaxy is moving (relative to us), we say that the redshift is …
bigger
smaller
the same
There is no correlation between speed and size of red-shift
The light waves are 'stretched' more by faster moving objects
Author:  Martin Moore

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