Using microwaves

1.  The case of a microwave oven is made of .
This microwaves.
Food contains molecules.  These microwaves and become hot.
The food is put into containers made of , or .  These materials allow microwaves to pass through them very easily.  We say that they the microwaves.

2.  What wavelengths of microwaves are used for satellite televisions?

     Why are these wavelengths used?

3.  We use a dish to collect enough microwaves for a strong signal.  This the microwaves on to an aerial.
The aerial transfers energy from the microwaves as an signal.

What you need to remember
In microwave ovens, the microwaves are strongly absorbed by molecules in food.  The energy from the microwaves makes the food .
Metals things microwaves, even if they are full of small holes.
Some microwaves can pass easily through the Earth's .
These microwaves are used to carry information to and from .

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