Karteikarten
P1 Topic 5
Karten in diesem Stapel (19)
- 1Name the 2 types of signalAnalogue and Digital
- 2What doe information need to be converted into before it gets transmitted?Electrical signals
- 3What values can an analogue signal take?Any value within a certain range
- 4What values can a digital signal take?Can only take two values, called on/off or 1/0
- 5What does multiplexing mean?Sending many signals together
- 6What 3 advantages are there of using digital signal?Transmits more information by multiplexing, less interference, only the signal is amplified noise is ignored
- 7What 3 disadvantages are there of using analogue signal?Difficult to multiplex signals, more interference, noise is picked up by interference and is amplified with the signal
- 8Why does UV rays from the sun cause skin cancer?The UV rays damages the DNA in your cells
- 9Why does darker skin give some protection against UV rays?It absorbs more UV radiation . This prevents some of the damaging radiation from reaching the more vulnerable tissues deeper in the body
- 10What does sun cream do?Absorbs or reflects some of the suns UV radiation on the skin exposed to sunlight
- 11What does the ozone layer do?Absorbs some of the UV rays from the sun so it reduces the amount of UV radiation reaching the Earth's surface
- 12Why has the ozone layer go thinner?Because of pollution from CFC's
- 13Where do seismic waves travel?Inside the Earth
- 14When do seismic waves occur?When there is an earthquake
- 15How are seismic waves recorded?Using Seismographs
- 16What are the 2 types of seismic waves?S waves and P waves
- 17Explain 5 things about P wavesLongitudinal, primary waves, travel faster, travel through both solids and liquids, refract as density changes
- 18Explain 4 things about S wavesTransverse, Secondary waves, travel slower, only travel through solids
- 19What do the seismograph results tell us about the structure of the Earth?There are no S waves in outer core so it must be liquid, there are S waves in mantle so it must be solid, P waves travel faster through inner core so it must be solid but slower in outer core so it must be liquid.
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- Karteikarten am P1 Topic 5, erstellt von jade16 am 18/01/2015.
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