SP3j Using electromagnetic waves and their dangers

Question 1

What are radiowaves used for? (1)

Answer 1

.communications

Question 2

What are microwaves used for? (2)

Answer 2

.cooking
.communication + satellite transmission

Question 3

What are infrared waves used for? (4)

Answer 3

.communication in short distances
.remote controls
.security systems
.heating food

Question 4

What are ultra violet waves used for? (2)

Answer 4

.disinfect water by killing micro-organism in it
.check fake bank notes (bank notes are fluorescent, this means when ultraviolet light shines on them they react producing an image which are eyes can see)

Question 5

What are x-rays used for? (2)

Answer 5

.in hospital to look at bones/inside your body
.in security scanners

Question 6

What are gamma rays used for? (2)

Answer 6

.sterilisation of medical equipment (killing potentially harmful micro-organisms)
.in treatments of cancer cells (radiotherapy)

Question 7

What are electromagnetic waves produced by and how?

Answer 7

changes in the atom - atoms absorb energy, cauing electrons to jump to higher energy levels. When they drop back to their original level they emit electromagnetic waves.

Question 8

Effect of microwaves on the body.

Answer 8

cause internal heating of body tissue.

Question 9

Effect of infrared waves on the body.

Answer 9

radiation is felt as heat and causes skin to burn.

Question 10

Effect of x-rays on the body.

Answer 10

damage cells causing mutations (which may lead to cancer) and cell death.

Question 11

Effect of gamma rays on the body.

Answer 11

damage cells causing cell mutations and cell death.