6. how can we tell that ultra violet radiation is present
it causes your skin to burn
it turns water green
it makes certain chemicals emit light
it causes metals to react with water
7. which of the following is not a use for infra red
remote control handsets
communication
infra-red scanners
heaters
8. Which of the following is not a use for mircrowaves
heating food
tanning
microwave ovens
communication
9. radio waves work by
they are produced by satellites and beamed using radio waves at stations
they are emitted from an ariel where we apply alternating voltage to it. The frequency produced is the same as the frequency of the alternating voltage,when it pass' across the reciever they cause tiny alternating voltage to the ariel
they are reflected using solar panels so the signals go all over the world, they are processed in stations are then released
microwaves are used to beam radiowaves up to the satellite the radio waves go into the satellites system where is is beamed out all over the world
10. what do x-rays pass through
organs
soft tissue
bones
musles
11. what do all the waves on the EM spectrum have in common
their wave lengths are the same
they are all longitudinal waves
go same speed in a vacuum
they all have the same frequency
12. what is a danger of using gamma rays
they can make you blind
they damage your ear drums
they can cause cancer
they can cause burnt skin
13. what are x-rays absorbed by
bones and thick metal plates
skin
tissue
veins
14. what 2 waves on the EM spectrum have no known danger of being used
micro waves, radio waves
x-rays, visible light
visible light, radio waves
gamma rays, infra-red
15. what is ultra violet used for
infra red scanners
heaters
sun beds and security markings
heating food
16. what can exposure to ultra violet radiation cause
