GCSE - Gcse Physics - Waves - The Expanding Universe Solution

Q.1.

How do we know that the Universe is currently expanding?

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Light waves from distant galaxies are shifted so that they appear redder than they normally would
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Light waves from distant galaxies are shifted so that they appear bluer than they normally would
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Gamma waves from distant galaxies are shifted so that they appear redder than they normally would
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Delta waves from distant galaxies are shifted so that they appear redder than they normally would

Q.2.

How long does it take the light from the sun to reach us?

Q.3.

How do we know black holes exist if we cannot see them?

Q.4.

The faster a star or galaxy is moving (relative to us), we say that the redshift is …

Q.5.

What is blueshift?

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When blue light is emitted from a source
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When an object is moving towards an observer, the light emitted from the object is shifted to the blue part of the spectrum
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When an object is moving towards an observer, the light emitted from the object is shifted to the red part of the spectrum
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There is no such thing as blue shift

Q.6.

What happens to the wavelength of light from stars that are moving away from us?

Q.7.

What types of radiation are emitted by the Sun?

Q.8.

"In space no one can hear you scream" was a famous movie quote, but is that actually true and why?

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It is not true
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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
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It is not true, but we don't know why
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It is true. Space is too cold for sound waves to travel

Q.9.

The shift seen when an object is moving towards us is not red, it is …

Q.10.

If scientists find new evidence that doesn’t support the Big Bang Theory, what should other scientists do?