True or false?True or false?

When you make When you make Readybrek in a Readybrek in a

microwave, it heats microwave, it heats up the bowl.up the bowl.

True or false?True or false?

In fact it’s false. The In fact it’s false. The microwaves heat up the microwaves heat up the food inside the bowl – food inside the bowl –

not the bowl itself.not the bowl itself.

Don’t believe me – you Don’t believe me – you will.will.

Lesson 6

What’s cooking

You will be successful if you can: • Describe how microwaves heat up

some materials

• Explain why microwave radiation doesn’t heat up other materials

• Describe how microwaves are designed to prevent radiation from cooking you!  

• Explain how the intensity and duration of exposure to non-ionising radiation determines its heating effect

Think about the following questions

Are there things that you cannot put in microwave

ovens?

How do microwaves work?

Why do microwaves not heat up the particles in glass

and your cereal bowl?