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Sunshine causes sun burn, long time exposure may cause skin cancer. |
Clothes and glasses are enough for protection. |
As
a laser beam is focused to a point on the retina and may damage it, it
is used under regulations. |
In public area, laser beams are used under the strict safety regulations. |
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If resonance occurs, the body behaves like an antenna.
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![](img_bio/ceram.jpg)
High frequency electromagnetic waves give influence only on the surface of the body. |
Low frequency waves tends to penetrate into the body. |
The electrostatic shock is harmless. |
Power line in a house gives a harmful shock. |