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PHYSICS REVISION

P1- THE EARTH IN THE UNIVERSE

Rocks provide evidence for changes to the earth (erosion and sedimentation, fossils, folding,
radioactive dating, craters)

Continents would be worn down to sea level if mountains were not being constantly formed. Rocks
are constantly changing and being recycled. Erosions + lava from…

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The extinction of the dinosaurs- 65 million years ago- could be asteroid collision (but dinosaurs
died before this) or volcano eruption (layers of basalt in India- but basalt in N-Ireland- no extinction
there

Light travels at a high but finite speed- 300,000 km/s- speed of light- distance travelled by light…

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All stars have a life cycle (learn?)

Astronomers have detected planets around some nearby stars

Even if a small proportion of stars have planets, many scientists think that it is likely that life exits
somewhere else in the universe- there is no evidence of alien life.

Distant galaxies are moving…

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stopping- this is cancer. Radiation sickness is when you are exposed to high levels, it can kill your cells
altogether.

UV radiation from the sun is ionising can cause damage to cells in the skin. Sun burn and skin cancer.

The metal cases and door screens of microwave ovens protect…

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Gamma- stopped by thick lead- type of EM radiation (no mass) can penetrate a long way, just
energy, so it doesn't change the element of the nucleus that emits it. Get rid of extra energy, can
irradiate surgical instruments and track the movement of chemical inside the body



Over time,…

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Compare the amount of energy released during a nuclear fission to that released in a chemical
reaction...

The nuclear fission process in nuclear power stations is controlled: .... terms: chain reaction, fuel
rod, control rod and coolant

Nuclear power stations produce radioactive waste. Nuclear wastes are categorised as high level…

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