Waves

Question 1

Transverse waves

Answer 1

Particles move/ vibrate perpendicular to the transfer of energy

Question 2

Longitudinal waves

Answer 2

Particles move/vibrate parallel to the transfer of energy

Question 3

Examples of transverse waves

Answer 3

Ocean waves, All EMS waves, S waves

Question 4

Examples of longitudinal waves

Answer 4

Sound, P-waves

Question 5

Label a transverse wave

Answer 5

Peak, trough, amplitude, wavelength, frequency

Question 6

Label a longitudinal wave

Answer 6

Compression, rarefaction, wavelength, frequency

Question 7

What is frequency & its equation

Answer 7

Number of waves per second
1/period(time)

Question 8

When will an objects temperature increase (radiation)

Answer 8

If it absorbs more infra-red than it gives out

Question 9

What is the definition of a perfect black body

Answer 9

Something that absorbs and emits all wavelengths of radiation

Question 10

What is the speed of light

Answer 10

300,000,000 m/s

Question 11

Similarities between all EM waves

Answer 11

Transverse
Reflected
Refracted
Polarised

Question 12

What does it mean if a wave is polarised

Answer 12

It’s vibrations are confined to single plane

Question 13

Dangers of All EMS

Answer 13

Radio- None
Microwaves- Cause water to vibrate- damage brain
Infra-Red- Cause us to be too hot
Visible- Blind us if too much
Ultra-violet- Ionising cancer
X-rays- Ionising cancer
Gamma- Ionising cancer

Question 14

Uses of all EMS

Answer 14

Radio- TV and Radio
Microwaves- Heat up food, satellite communication
Infra-Red Remote controls, cooking food
Visible- To see, fibre optics
Ultra violet- Scans, to get tanned
X-rays Medical Imaging
Gamma Treatments

Question 15

Which states of matter does sound travel the fastest and slowest in

Answer 15

Fastest in solids, slower in gases

Question 16

What does sound need to be able to pass through

Answer 16

A medium

Question 17

Range of human hearing

Answer 17

20-20000Hz

Question 18

Increased amplitude in sound

Answer 18

Louder

Question 18

Increased frequency in sound

Answer 18

Higher pitched

Question 19

Uses of ultrasound

Answer 19

Produce medical images of the body

Question 20

What can p-waves pass through

Answer 20

Solids and liquids

Question 21

What can s-waves pass through

Answer 21

Solids

Question 22

Properties of a reflection in a mirror

Answer 22

Virtual
Equal in size, equal in distance from mirror
Laterally inverted
Same way up

Question 23

How does refraction occur

Answer 23

When a wave hits a different medium at an angle, some parts of the wave hit the medium sooner, when going into a different medium the wave changes speed, to catch up with this different speed wave, the entire wave turns
Bends towards the normal

Question 24

Convex vs concave lenses

Answer 24

Convex is fatter at the centre Concave is thicker at the ends

Question 25

Are convex lenses producing real or virtual images

Answer 25

Can be both

Question 26

Concave produce real or virtual images

Answer 26

Virtual

Question 27

Real image definition

Answer 27

Actual intersection of light rays

Question 28

Virtual image definition

Answer 28

Imaginary intersection of light rays

Question 29

Why does something appear to our eyes red

Answer 29

It absorbs all visible light apart from red which it reflects

Question 30

If all wavelengths are absorbed by an object it is

Answer 30

Black

Question 31

If all wavelengths are reflected by an object it is

Answer 31

White

Question 32

How does a white light shining through red filter work

Answer 32

Absorbs all light apart from red

Question 33

White light through red filter and green filter projects

Answer 33

Nothing

Question 34

Angle reflection law

Answer 34

Angle of incidence = angle of reflection