Waves: Uses of EM waves"

Question 1

What are the uses of radio waves?

Answer 1

• Transmit Radio and Terrestrial TV signals.

Question 2

What are microwaves used for?

Answer 2

• Heating food

- Used to communicate with satellites in space.

Question 3

What are infrared radiation used for?

Answer 3

• Emitted by electrical heaters
  = used to cook food
  = used in infrared cameras

Question 4

What is visible light used for?

Answer 4

• Communication using fibre optics.

= telephone and cable tv signals

Question 5

What is Ultra Violet used for?

Answer 5

• Energy efficient lightbulbs.

= sun tanning

Question 6

What are the uses for X-rays and Gamma rays?

Answer 6

• Used for medical imaging.
• X-Rays: Visualise broken bones.
• Gamma Rays: detect cancer.
  = medical treatment.

Question 7

How are radio waves suitable for it’s purpose?

Answer 7

= travel long distances before being absorbed
= long wave length waves can spread out between hills
= reflect off layer of charged particles in atmosphere
= long distances around the earth

Question 8

How are microwaves suitable for it’s purpose?

Answer 8

= water molecules absorb energy of microwaves- temp inc

= microwaves can pass through the earths atmosphere without being reflected or refracted

Question 9

How are infrared waves suitable for it’s purpose?

Answer 9

= energy of infrared is easily absorbed by the surface of objects

Question 10

How are visible light suitable for it’s purpose?

Answer 10

= short wavelength

= carry great deal of information

Question 11

How are ultra-violet light suitable for it’s purpose?

Answer 11

= short wavelength
= carries more energy than visible light
= energy is absorbed by internal surfaces bulb and converted into visible light- less energy than normal

Question 12

How are x-rays and gamma rays suitable for it’s purpose?

Answer 12

= very penetrative- easily pass through body tissue
= x-rays are absorbed by bones
=