5.20-5.24 Dangers and uses of electromagnetic waves

Question 1

When does the potential danger of an electromagnetic wave increase?

Answer 1

With increasing frequency

Question 2

What dangers occur with microwaves?

Answer 2

.Internal heating of body cells

Question 3

What dangers occur with infrared rays?

Answer 3

Skin burns

Question 4

What dangers occur with ultraviolet rays?

Answer 4

.Damage to surface cells and eyes

Question 5

What dangers occur with X rays and Gamma rays?

Answer 5

Mutations or damage to cells in body

Question 6

Give two uses of radio waves

Answer 6

.Broadcasting
.Communication
.Satellite transmissions

Question 7

Give two uses of microwaves

Answer 7

.Cooking
.Communications
.Satellite transmissions

Question 8

Give two uses of infrared rays

Answer 8

.Cooking
.Thermal imaging
.Short range communications
.Optical fibres
.Television remote controls

Question 9

Give two uses of visible light

Answer 9

Vision
Photography
.Illumination
.Security
.Fluorescent lamps

Question 10

Give two uses of Ultraviolet ?

Answer 10

.Security Marking
.Fluorescent lamps
.Detecting forged bank notes
.Disinfecting water

Question 11

Give two uses of X rays

Answer 11

.Observing internal structure of objects
.Airport security scanners
.Medical X rays

Question 12

Give two uses of Gamma rays

Answer 12

.Sterilising food
.Sterilising medical equipment
.Detection of cancer
.Cancer treatment

Question 13

What can radio waves be produced by?

Answer 13

Oscillations in electrical circuits

Question 14

What can radio waves be induced by?

Answer 14

Oscillations in electrical circuits

Question 15

What can changes in atoms and nuclei generate?

Answer 15

.Generate radiations over a wide frequency range

.Caused by absorptions of a range of radiations