4. they have similar frequency to the vibrations of molecules, therfore holding mobile phone(which use microwaves) close to your brain. can heat human body cells and may be linked to brain tumours. but nothing has been proved.
5. they can make the surface molecules of any substance vibrate.and this has a heating effect, it has a higher frequency than microwaves, so it carries more energy. so for the human body, too much infrared can cause skin burns.
6. has more energy than infrared, and higher frequency. its ionising, so it has enough energy to knock electrons off atoms. sun burn happens when surface skin cells absorb UV rays in sunlight. this an cause cell mutation or destruction.and skin cancer. can also lead to eye damage.
7. very high frequency waves. they are also ionising, and carry more energy than UV rays.this means they can be much more damaging and penetrate further into the body. this can lead to cell mutation or destruction leading to tissue damage or cancer.
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