31 Waves Gamma radiation (rays) -1 Gamma rays can kill harmful bacteria in food.
32 Waves Gamma radiation (rays) - 2 Gammas are used to sterilise surgical equipment
33 Waves Gamma radiation (rays) - 3 Gamma rays are used in medicine to kill cancer cells
34 Stars emit em waves Stars emit all types of em waves we see the visibleFeel the IRMay be damaged by the UVAstronomers ‘look’ at all the parts
35 Waves The effect on living cells of microwaves Absorbed by the water in cellsThe cells can be damaged or killed by the heat
36 Waves The effect on living cells of infra red Absorbed by skinFelt as heatCan cause burns
37 Waves The effect on living cells of ultra violet Can pass through skin to deeper tissues.Absorbed more by darker skinHigh doses can kill normal cells
38 Waves The effect on living cells of X –rays and gamma rays Can pass through soft tissuesSome is absorbed by the cellsHigh doses can kill normal cellsLow doses can cause normal cells to mutate and become cancerous
39 Waves Ionising radiation Gamma and X radiation are ionising and must be treated with caution.They can be both useful and dangerous.