Light and the electromagnetic spectrum

Question 1

Name the waves in the EM spectrum

Answer 1

Radio, microwaves, infra-red, visible light, ultra violet, x-rays, gamma

Question 2

Name some uses of radio waves

Answer 2

Communications, tv, radio

Question 3

Name some uses of micro waves

Answer 3

Heat food, wifi, bluetooth

Question 4

Name some uses of infra-red waves

Answer 4

Heat treatment, take pictures in the dark, short term communications

Question 5

Name some uses of visible light

Answer 5

To see, traffic lights

Question 6

Name some uses of ultra-violet

Answer 6

Sun tan, kill bacteria, detect forgery

Question 7

Name some uses of x-rays

Answer 7

Medical imaging, security

Question 8

Name some uses of gamma rays

Answer 8

Kill cancer cells, sterilize equipment, mutating cells, medical imaging

Question 9

What EM wave has the longest wavelength

Answer 9

Radio wave

Question 10

What EM wave has the shortest wavelength

Answer 10

Gamma

Question 11

What EM wave has the highest frequency

Answer 11

Gamma

Question 12

What EM wave has the lowest frequency

Answer 12

Radio wave

Question 13

What do all EM waves have in common (3 things)

Answer 13

They’re all transverse waves, all travel at speed of light in a vacuum and all transmit energy from a source to an observer

Question 14

Name a danger of radio waves

Answer 14

There aren’t any

Question 15

Name a danger of microwaves

Answer 15

Can produce burns and cataracts

Question 16

Name a danger of infra-red

Answer 16

Can cause burns and damage cells

Question 17

Name a danger of ultra violet

Answer 17

Can cause damage to eyes and skin cells and can cause burns

Question 18

Name a danger of x-rays

Answer 18

mutating cells and can cause cancer

Question 19

Name a danger of gamma rays

Answer 19

Mutating cells, kills cells and can cause cancer

Question 20

How do microwaves heat food

Answer 20

Microwaves heat food from the inside by heating water particles inside food. The water particles touch the other ones and produce energy, therefore produces heat.