EM Waves And The Elctromagnetic Spectrum

Question 1

What types of waves are EM waves?

Answer 1

Transverse waves

Question 2

What is radiation?

Answer 2

Energy transferred as a wave spreading out from a source. E.g light, infrared, sound.

Question 3

List the Properties of EM waves

Answer 3

1) They transfer energy from the source of the waves to an absorber.
2) They can travel through a vacuum.
3) Can travel through a vacuum or air at the same speed.

Question 4

What phrase can help you remember the EM spectrum?

Answer 4

Roman Men Invented Very Unusual X-ray

Question 5

What electromagnetic wave has the longest wave length but lowest frequency?

Answer 5

Radio waves

Question 6

What EM wave has the highest frequency but shortest wavelength?

Answer 6

Gamma rays

Question 7

What are Radio waves used for?

Answer 7

Radio waves are used for communication such as broadcasting television and radio, communications and satellite transmissions.

Question 8

What are Microwaves used for?

Answer 8

Cooking food, communications and for satellite communication. Intense sources of microwaves can be dangerous through the internal heating of body cells.

Question 9

What can infrared light be used for?

Answer 9

Used by electrical heaters, cookers for cooking food, short range communications like remote controls, security systems and thermal imaging. The heating effect of IR can cause burns to the skin.

Question 10

What are the uses of visible light?

Answer 10

Visible light is the light we can see, so is used in photography and illumination. It’s also used in fibre optic communications.