EM waves and their uses Flashcards
What are microwaves used for?
Satellites and microwave ovens
Why are microwaves used for satellites?
They can pass easily through Earth’s watery atmosphere
How are microwaves used for satellite tv?
Signal from a transmitter is transmitted into space, picked up by a satellite receiver dish, transmitted to earth in a different direction and received by a satellite dish on the ground
How are microwaves used for microwave ovens?
It is absorbed by water molecules in food, causing the water to heat up and transfer the energy to the rest of the molecules by heating, cooking the food.
What is infrared radiation used for?
- Monitoring temperature
- Electric heaters
- Cooking food
What is visible light used for?
Fibre optic cables
What is ultraviolet radiation used for?
Flourescence, security pens and suntans
What are x-rays used for?
X-ray photographs because x-rays can pass throguh flesh but not bone
What are gamma rays used for?
Killing cancer cells
