P13

Question 1

What are EM waves?

Answer 1

Transverse waves that transfer energy from a source to an absorber.

Question 2

Whats an example of am EM wave?

Answer 2

Hot object transferes energy by emitting infrared radiation which is absorbed by the air.

Question 3

What do all EM waves travel at?

Answer 3

The same speed through air or a vaccum

Question 4

Radio waves wave length?

Answer 4

1m - 10^4m

Question 5

Micro waves wavelength?

Answer 5

10^-2m

Question 6

Infra red wavelength?

Answer 6

10^-5m

Question 7

Visible light wave length?

Answer 7

10^-7m

Question 8

Ultra violet wave length?

Answer 8

10^-8m

Question 9

X-rays wave length?

Answer 9

10^-10

Question 10

Gamma rays wave length?

Answer 10

10^-15

Question 11

Why is there a large range of frequencies?

Answer 11

Because EM waves generate by a variety of changes in atoms and their nuclei

Question 12

What do human eyes detect?

Answer 12

Visible light

Question 13

How are radio waves made?

Answer 13

Oscillating charges

Question 14

What happens when radio waves are absorbed?

Answer 14

They create alternating currents with the same frequency as the radio wave itself

Question 15

What can changes in atoms and nuclei result to?

Answer 15

EM waves generated or absorbed over a wide frequency range

Question 16

Where do gamma rays originate from?

Answer 16

Changes in nucleus of an atom

Question 17

What effects do UV, Xrays and gamma rays have on the human body?

Answer 17

Effect human body tissue

Question 18

What is radiation dose?

Answer 18

Is measure of risk exposing the body to radiation

Question 19

100msv =

Answer 19

1Sv

Question 20

What can UV increase?

Answer 20

• Skin age to increase
• Skin cancer

Question 21

Uses of radio waves?

Answer 21

Television and radio

Question 22

Uses of microwaves?

Answer 22

Satelite communication and cooking food

Question 23

Use of infrared

Answer 23

Electrical heaters, cooking food,infrared cameras

Question 24

Uses of visible light?

Answer 24

Fibre optic communications

Question 25

Use of ultraviolet?

Answer 25

Energy effecient lamps, sun tanning

Question 26

Uses of xrays and gamma rays?

Answer 26

Medical imaging and treatement