101 EM Waves Revision

What are the dangers of radio waves?

• No known dangers
• Ionising cells and causing cancer
• Skin burns
• Cause global warming
• Loss of hearing

What is an example of protection against radio waves

• No protection needed
• Gloves
• Plastic, clear goggles
• Lead lined suit to stop ionisation
• Outside a 15m radius

What is a use of radio waves

• Communication (radio and to)
• Nuclear fission
• Sterilisation and medicine
• Charging electronic devices
• Nuclear fusion

Radio waves are easily transmitted through…

• Air
• Glass
• Water
• Magnesium
• Nitrogen

How long are radio waves wavelengths, when transmitting signals

• A few m
• A few μm
• A few mm
• A few km

What is a danger of microwaves?

• Heat damage
• Cell mutations
• greenhouse gases
• No dangers

What a microwaves used for?

• Heating food
• Watching TV
• Listen to music
• Medical uses

Why are microwaves used to heat food over infrared waves?

• They can penetrate further
• It is cheaper to use
• It is less dangerous
• It is much quicker

What are safety precautions used when using a microwave

• Has a metal casing
• Wear sunglasses
• Use tongs
• Spray with water

Microwaves heat up objects because it is absorbed by water molecules.

• True
• False