Waves

Question 1

What are the 2 types of waves ?

Answer 1

Longitudinal
Transverse

Question 2

What do longitudinal waves show ?

Answer 2

Compression
Rarefraction

Question 3

What is an example of a longitudinal wave ?

Answer 3

Sound waves

Question 4

What is an example of transverse wave ?

Answer 4

Ripples on the water

Question 5

What is the amplitude of a wave ?

Answer 5

wave is the maximum displacement of a point on a wave away from its undisturbed position

Question 6

What is the wavelength of a wave ?

Answer 6

the distance from a point on one wave to the equivalent point on the adjacent wave

Question 7

What is the frequency of a wave ?

Answer 7

the number of waves passing a point each second

Question 8

What is the wave speed of a wave ?

Answer 8

the speed at which the energy is transferred (or the wave moves) through the medium

Question 9

What is frequency measure in ?

Answer 9

H or hertz

Question 10

What type of waves are elctromagentic waves ?

Answer 10

Transverse

Question 11

What do electromagnetic waves do ?

Answer 11

transfer energy from the source of the waves to an absorber

Question 12

Do all electromagnetic waves travel at the same velocity through a vacuum ?

Answer 12

Yes

Question 13

What is a vacuum ?

Answer 13

Space or air

Question 14

What are the waves that form the electromagnetic spectrum grouped in ?

Answer 14

terms of their wavelength and their frequency

Question 15

What does the em spec vary from ?

Answer 15

Long - short /wavelength
Low - high /frequency

Question 16

In what order does the EM spec go in ?

Answer 16

Radio waves
‘
Microwaves
‘
Infrared
‘
Visible light
‘
Ultraviolet
‘
X-rays
‘
Gamma rays

Question 17

What can our eyes only detect ?

Answer 17

Visible light

Question 18

What causes refraction ?

Answer 18

due to the difference in velocity of the waves in different substances

Question 19

What is a refraction ?

Answer 19

When light is bent when it goes through a medium

Question 20

How are radio waves produced ?

Answer 20

oscillations in electrical circuits

Question 21

What happens when radio waves are absorbed ?

Answer 21

they may create an alternating current with the same frequency as the radio wave itself

Question 22

What can changes in the atom and the nuclei of the atom cause ?
Give an example

Answer 22

can result in electromagnetic waves being generated or absorbed over a wide frequency range

Gamma rays

Question 23

What 3 EM waves can have hazardous effects on human body tissue ?

Answer 23

Ultraviolet waves, X-rays and gamma rays

Question 24

For the 3 waves to have an effect on human tissue what does it depend on ?

Answer 24

type of radiation and the size of the dose

Question 25

What is 1000 millisieverts (mSv) equal to ?

Answer 25

1000 millisieverts (mSv) = 1 sievert (Sv)

Question 26

What effect do ultraviolet waves have on skin ?

Answer 26

skin to age prematurely
increase the risk of skin cancer

Question 27

What type of radiation are x-rays and gamma rays ?

Answer 27

Ionising radiation

Question 28

What can X-rays and gamma rays cause ?

Answer 28

mutation of genes and cancer

Question 29

What can radio waves be used for ?

Answer 29

Television and radio

Question 30

What can microwaves be used for ?

Answer 30

satellite communications, cooking food

Question 31

What can infrared be used for ?

Answer 31

electrical heaters, cooking food, infrared cameras

Question 32

What can visible light be used for ?

Answer 32

fibre optic communications

Question 33

What can ultraviolet waves be used for ?

Answer 33

energy efficient lamps, sun tanning

Question 34

What can X-rays and gamma rays be used for ?

Answer 34

medical imaging and treatments