Waves

Electromagnetic Waves - Microwaves.

Microwaves have wavelengths shorter than radio waves.

Some of these wavelengths pass easily through the atmosphere
and are used to transmit information to satellites.
Satellite TV and mobile phone (or smartphone) networks use microwaves.
Some people have concerns that microwaves from mobile phones
may be harmful. However, the intensity of the microwaves emitted
from mobile phones is low and the evidence is not conclusive.


Other microwaves have wavelengths which are absorbed by water molecules.
Microwave cookers use these waves which give energy
 to the water molecules in food, causing it to get hot.
The cooker has a metal door screen and outer case
which absorb or reflect microwaves to protect people who use it.

Living cells can also absorb microwaves.
The cells may be damaged or killed by the heating effect of the waves.
Skin cells can be burned.

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