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What scientific principle allows microwaves to heat food?
Microwaves make water molecules vibrate, creating heat
What is the main use of microwaves today?
Heating and cooking food
Why were early microwaves not popular?
They were huge and expensive
What year was the first commercial microwave oven released?
1947
Why does metal reflect microwaves?
Because of free-moving electrons
What did Spencer build to safely contain microwave energy?
A metal box (prototype microwave oven)
What food exploded during one of his tests?
An egg
What was the first food he intentionally cooked?
Popcorn
What food did he test after the chocolate melted?
Popcorn
True or False: Spencer was trying to cook food on purpose?
False
What do magnetrons produce?
Microwaves
What device was Spencer testing when he made the discovery?
A magnetron
What melted in Spencer’s pocket during the experiment?
A chocolate bar
What company was Spencer working for during his discovery?
Raytheon
Who discovered the microwave oven by accident?
Percy Spencer
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