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physics p1h
Fichas del conjunto (19)
- 1where does an earthquake occur?at plate boundaries
- 2when does an earthquake occur?when the two plates have been pushing against each other and energy builds up, when sliding past each other causing the energy to be released
- 3what equipment do we use to detect a surface wave?siesmometer
- 4what does a seismometer produce?seismograph
- 5how have the properties of seismic waves allowed us to build a model of the inside of the earth?because we know properties,and what they travel through.
- 6describe P-wavesp-waves produce primary waves/pressure waves and it is a longitudinal wave.
They travel through solids and liquids at 8km per second, faster than S waves and so arrive before S waves. - 7describe S-wavesS-waves are secondary waves/shear waves and they are slower and so arrive second. They are a transverse wave, so cause more damage but S-waves only travel through solids.
- 8describe L-wavesthese waves are waves on the surface and they travel out from the epicentre of the earthquake
- 9what type of radiation causes skin cancer and burning?UV radiation
- 10how does UV radiation cause skin cancer?It damages the DNA in the cells, which can cause uncontrolled growth which can lead to cancer
- 11what can we do to protect ourselves when in the sun?wear sun hats/use sun cream
- 12how can we calculate safe time?recommended time x SPF factor
- 13what is the name of the pigment in our skin which is activated when our skin is exposed to UV radiation?melanin
- 14why do we tan?> becayse when our skin absorbs UV radiation it stimulates melanin production.
>having more melanin in the skin allows you to absorb more UV which prevents UV getting to deeper layers in the skin. - 15why can people with darker skin stay in the sun longer more safely?because they have more melanin in the skin which absorbs more UV radiation meaning less can get to deeper layers
- 16why is there a hole in the ozone layer?due to CFCs which damages O3
- 17what happens when CFCs come into contact with UV?UV breaks down CFCs into reactive chlorine atoms, these atoms break down the ozone
- 18why is the hole in the ozone dangerous?because the ozone would absorb the radiation, if ozone is damaged more ozone will reach earth, increase in people getting sunburnt
- 19what have governments done in response to the link between the use of CFCs and the depletion of the ozone layerreduce/banned the use of CFCs
produce chemicals to replace them which do not produce CFCs
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- Fichas sobre physics p1h, creado por parkermolly20 el 06/06/2015.
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