Welcome to the Quiz!
This quiz contains 11 questions from a mix of 1 subtopics.
Which side of the absorption spectra above has the longer wavelength?
The red side on the left
The violet side on the right
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extra / missing / wavelengths / reflected / absorbed
- A star emits light of all wavelengths.
- However, some of light are by chemicals in the star's atmosphere.
- Therefore, light that reaches the earth has some wavelengths of light .
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Which of these provides evidence for the Big Bang?
Red-shift
Blue-shift
Doppler effect
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Red-shift is when light from distant galaxies show an absorption spectra pattern that has been shifted to:
The red side of the spectra
The violet side of the spectra
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How many galaxies show a red-shift?
Nearly all
None
Only a few
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smaller / larger / decrease / increase / towards / away
Red-shift occurs because the light emitted by an object moving from us will be stretched. The stretching causes the light's wavelength to . The faster an object moves away from us, the the red shift.
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Which is the correct explanation for why galaxies are moving away from each other?
Space and the universe itself is expanding and this makes galaxies further apart
Galaxies are moving away from each other by travelling through space
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What is the basic idea of the Big Bang theory?
The Universe expanded from a single tiny point of high density and pressure
Two black holes merged to create the universe
The Universe will end in a cold expanse of darkness
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Give one strength and one weakness of the balloon model in representing the idea of an expanding Universe.
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Why do we believe in the big bang theory?
universe / contracting / expanding / red-shift / away / bang
- Light that reaches earth from other galaxies shows , and the further away the galaxy the more red-shifted its light is.
- This suggests that all galaxies are both moving away from us, and moving from each other.
- This suggests that the whole universe is .
- If we extrapolate further and further back in time, it implies that the universe must have been smaller in the past.
- Ultimately, it's believed the universe started from a single point which had all of the mass and energy of the contained in that point.
- The expansion of the universe from this initial small point is called the big and started about 13.8 billion years ago.
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Why do scientists believe in the Big Bang theory?
It feels right
It was the first scientific idea to explain the beginning of the Universe
Its predictions are supported by observations
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