Waves

Question 1

what is a wave?

Answer 1

a regular oscillation of a medium caused by vibrating sources

Question 2

what is the gap between the peak of the wave and the equilibrium called

Answer 2

amplitude

Question 3

what is the bottom of a wave called

Answer 3

trough

Question 4

what is the top of a wave called

Answer 4

peak or crest

Question 5

what is it called when waves are very close together

Answer 5

compression

Question 6

what is it called when waves are far apart from each other

Answer 6

rarefaction

Question 7

give an example of a longitudinal wave

Answer 7

sound

Question 8

give an example of a transverse wave

Answer 8

water, light

Question 9

where do you measure 2 waves from in the waves req prac in liquids?

Answer 9

the centre of the 2 shadows

Question 10

where do the waves pass through in a solid

Answer 10

a fixed point

Question 11

are radio waves safe?

Answer 11

yes

Question 12

uses of radio waves?

Answer 12

TV, Radio

Question 13

why is a microwave in a phone not dangerous

Answer 13

it operates at a very low power

Question 14

how does a microwave work when heating food?

Answer 14

cooks everything at the same time

Question 15

uses of micro waves?

Answer 15

cooking, communication

Question 16

how are infrared waves produced?

Answer 16

by hot vibrating atoms

Question 17

give a use of IR waves

Answer 17

security cameras, tv remotes, non conventional cooking

Question 18

can a IR wave be dangerous

Answer 18

yes but it has to be strong enough

Question 19

what is the risk of IR waves

Answer 19

getting burnt

Question 20

is visible light harmful?

Answer 20

no

Question 21

what is the use of visible light?

Answer 21

to see things

Question 22

give a use of visible light

Answer 22

cameras

Question 23

is UV light visible?

Answer 23

no but some people can see it due to a rare condition

Question 24

is UV light dangerous?

Answer 24

yes if exposure is long enough

Question 25

what produces UV light

Answer 25

the sun

Question 26

why does UV light not harm us

Answer 26

the ozone layer cuts it out

Question 27

what do black people produce to repel UV light?

Answer 27

malignin

Question 28

how can UV light be repelled?

Answer 28

by sun screen

Question 29

what is the risk of UV, Xray's, and gamma rays?

Answer 29

cell damage

Question 30

why Xray's not dangerous when exposed rarely?

Answer 30

the bone absorbs the wave

Question 31

what can gamma, x-rays and UV light cause?

Answer 31

cancer

Question 32

what do gamma, x-rays and UV light do to cause cancer?

Answer 32

ionises

Question 33

what is a good use of gamma rays?

Answer 33

it can destroy cancer by blasting rays at a tumour

Question 34

At what speed to do all electromagnetic waves travel at

Answer 34

Speed of light

Question 35

Do electromagnetic waves travel at a different speed when in a material?

Answer 35

Yes

Question 36

What property of a wave decides what happens to the wave in a material?

Answer 36

Wave length

Question 37

What 3 things can happen to a wave when it is in a material?

Answer 37

It can be: reflected, transmitted or absorbed

Question 38

What are radio waves produced by and what can they create in wires?

Answer 38

Alternating currents

Question 39

The frequency of a radio wave is the same as the frequency of a ____

Answer 39

Alternating current

Question 40

What is the unit for a dose?

Answer 40

Sievert (SV)

Question 41

What is it called when you have something that causes radiation?

Answer 41

A dose of radiation

Question 42

How does conventional cooking work?

Answer 42

It cooks from the outside to in

Question 43

In the glass block practical what is the beam of light blasted in called?

Answer 43

Incident ray

Question 44

What is the perpendicular line called that goes against the rays?

Answer 44

The NORMAL line

Question 45

What is the ray called that comes out the end of the glass block

Answer 45

Emergent ray

Question 46

What ray goes through the glass block?

Answer 46

Refracted ray

Question 47

What are the 2 angles in the glass block experiment called?

Answer 47

Angle of incidence and angle of refraction

Question 48

Why does light change direction in the block?

Answer 48

It slows down

Question 49

Which type of cube is filled with water and has different coloured sides?

Answer 49

Leslie

Question 50

What kind of detector can be used to detect the surface which emits the most IR

Answer 50

Infrared

Question 51

Which coloured surfaces emit and absorb heat?

Answer 51

Darker

Question 52

Which coloured surfaces reflect and don’t change internal heat?

Answer 52

Lighter

Question 53

Are longitudinal wave oscillations parallel or perpendicular to the energy transfer?

Answer 53

Parallel

Question 54

Are transverse wave oscillations parallel or perpendicular to the energy transfer?

Answer 54

Perpendicular

Question 55

How wide is the electromagnetic spectrum

Answer 55

The spectrum is approximately 10^-15 to 10^4 metres