Radiation and Life P2 Revision mind map. photons Electromagnetic spectrum Low frequency high...
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Transcript of Radiation and Life P2 Revision mind map. photons Electromagnetic spectrum Low frequency high...
Radiation and LifeP2
Revision mind map
photons
Electromagneticspectrum
Low frequency
high frequency
radio
microwave
infrared
visible
ultraviolet
X-ray
gamma
Ionisingradiation Damages cells
Time exposure
Intensity (strength)
Precautionaryprincipal
ALARAprincipal
CFC’s
ozone
Greenhouse effectCarbon cycle
CO2
decompose
photosynthesis
Trapped radiation
respiration respiration
Hydrocarbonsfossil fuels
Carbon dioxide
Water vapour
methane
reflected radiation
Benefit / R
isk
Protects us from harmful UV
Radiation from the sun
Electromagnetic spectrum
RadioMicrowaveInfraredVisibleUltravioletX-raygamma
Low frequency / energy
high frequency / energy
Ionisingradiation
High doses kill cells. Smaller doses damage cells. Damaging the DNA can result in cancers.
To balance benefit / risk consider: exposure time, intensity and a shield that will absorb radiation i.e. lead, sunblock, etc.
Precautionary principal (better safe than sorry!)
ALARA principalAs Low As Reasonably Acceptable
Ozone (O3) absorbs UV
CFC’s found in fridges and aerosols deplete the ozone layer . Ozone protects all living things from harmful UV.
Global warming: Too much gases in the atmosphere absorb and trap (green house effect) the radiation.
Major greenhouse gases include:Carbon dioxide, methane and water
The carbon cycle is a balanced system.• Photosynthesis (removes)• Respiration (releases)• Burning fossil fuels (releases)• Death / excretion (releases)
Imbalance of the cycle can cause climate change: burning / deforestation
Photons
Explain what is happening in each of the pictures below
A B
Explain the pictures below
A B
Ionisingradiation
Carbon Cycle
Explain
Ionisingradiation
Mobile phones: what is the risk?