Waves

Question 1

Longitudal?

Answer 1

Partictiles , vibrate in the same dirction as the wave, example - sound

Question 2

Amplitude

Answer 2

Tells us how much energy the wave carries, measured center line to the crest/trough, symbol- A, Unit- m

Question 3

Transverse

Answer 3

Particles move at a right angle to the direction of travel. Example- Light,water

Question 4

Wavelength?

Answer 4

Length of a wave, Symbol-λ, unit- m

Question 5

Period

Answer 5

Time taken to produce 1 wave or time taken for a wave to pass a point, symbol- T, unit- Seconds

Question 6

Velocity

Answer 6

Distance a wave travels per second, symbol- V,unit ms-1

Question 7

What are the two types of waves

Answer 7

Transverse and Lomngitudal

Question 8

Energy Transfer?

Answer 8

Energy is transered through the paricles, the particles don’t move.

Question 9

Wave?

Answer 9

Waves transfer energy

Question 10

Frequency of a wave?

Answer 10

f=N/T

Question 11

What do all waves carry?

Answer 11

Energy

Question 12

Wave equation?

Answer 12

v=fλ

Question 13

Frequency?

Answer 13

how many waves are produced per second or how many waves pass a point per second. Symbol-F, unit Hz

Question 14

Formula for wave speed?

Answer 14

d=vt

Question 15

Real and apparent depth?

Answer 15

The depth of somthing looks shallower because the light ray is refracted at the surface and the brain assumes the light is in a straight line

Question 16

Long sight?

Answer 16

Can see distant object cleary, near objects appeared blurred. Convex lens used to make light rays come togheter and focus on retina.

Question 17

Law of reflection?

Answer 17

The angle of incidence is equal to the angle of reflection?

Question 18

Short sight?

Answer 18

Distant objects are blurry. Near objects are clear. Concave lens makes the rays seperate and focus on the retina.

Question 19

Refraction?

Answer 19

When light changes speed going from one substance too another, might also be also a change of direction

Question 20

What happens when light rays pass into a more dense material?

Answer 20

Slows down, bends towards the normal

Question 21

What happens when light rays pass into a less dense material?

Answer 21

speed up, bends away from the normal

Question 22

What happens when light enters a convex lens?

Answer 22

the rays come together

Question 23

What happens when light enters a concave lens?

Answer 23

Light rays move apart

Question 24

Where is the angle of incidense

Answer 24

Before entering the substance

Question 25

Where is the angle of refraction

Answer 25

After entering the substance

Question 26

Speed of sound in air?

Answer 26

340ms-1

Question 27

speed of sound in air compared to of states

Answer 27

fastest in solids,liquids then gases

Question 28

Experiment to measure speed of sound without a computer

Answer 28

Measure sound distance between sound produced and a place, measure the time from the sound being produced and you hearing it. use d=vt to calcute speed

Question 29

how do noise cancelling headphones work

Answer 29

microphone records noise, electronic device producees opposite signal they cancel out a produce silence

Question 30

how do hearing aids work

Answer 30

microphone picks up sound, change into a electronic signal, aplifide played through a loud speaker.

Question 31

speed of sound compared to speed of light

Answer 31

light is faster

Question 32

3 examples of light being faster than sound

Answer 32

fireworks, thunder storm, any game where a ball is struck

Question 33

what can sound travel through

Answer 33

anything with paricles, solids,liquids,gases

Question 34

what can sound not travel through

Answer 34

vaccum of space

Question 35

what is the range of human hearing

Answer 35

20hz to 20khz

Question 36

How to meausre the speed of sound using a computer

Answer 36

set up too microphones a known distance apart and connect both too a timer. hit someting at the end of one microphone and record the time then divide the distance by the time to give you the speed

Question 37

What unit is used to measuere sound levels

Answer 37

decibles(db)

Question 38

what does a wave with low frequency look like

Answer 38

the waves are longer and spread about more

Question 39

what does a wave with high frequency look like

Answer 39

the waves are shorter and coloser together

Question 40

what does a wave with loud sound look like

Answer 40

the amplitued is greater

Question 41

what does a wave with quiet sound look like

Answer 41

the amplitude is smaller

Question 42

how do humans hear

Answer 42

a noise is produced this vibrates paricles in the air as the sound wave travels it then enters are ear and vibrates the eardrum

Question 43

Ultrasound?

Answer 43

have a frequency to high to be heard by humans

Question 44

ultrasound used in nature, medicine and technology

Answer 44

nature- bats and dolphins use to find food. medicine to take pictures of an unborn baby. technologhy to find the depth of sea.

Question 45

what is sonar and ultrasound used for?

Answer 45

fishing boats use this to detect fish in the sea

Question 46

seven parts of the electromagnetic spectrum in order from lowest frequency

Answer 46

Radi, microwave, infra-red,visable light, ultraviolet,x-rays, gamma rays

Question 47

what speed do electromagnetic waves travel at

Answer 47

speed of light- 300,000,000ms-1

Question 48

what type of waves are electromagnetic waves

Answer 48

transverse and can travel through a vaccum

Question 49

what are electromagnetic waves

Answer 49

family of waves, human eye can only detect visable light

Question 50

what happens to the energy of an electromagnetic wave as the energy increases

Answer 50

the frequency also increases

Question 51

gamma rays?

Answer 51

detector- geiger-muller tube, use- radiothearpy, danger- cell distruction,mutaion and cancer

Question 52

x-rays?

Answer 52

detector- photographic film , use- medical scans , danger- cell distruction,mutaion and cancer

Question 53

ultra-violet?

Answer 53

detector- flurescent materials , use- security marking on bank notes, danger- sunburn skin cancer

Question 54

visable light

Answer 54

detector- retina , use- lasers, danger- burning, blindness if concentrated

Question 55

infra-red

Answer 55

detector- thermistor, use- remote controls, danger- burning if concentrated

Question 56

microwaves

Answer 56

detector- aerial, use- mobile phones, danger- burning if concentrated

Question 57

radio waves

Answer 57

detector- aerial, use- communications, danger- safe

Question 58

multiwave astronomy

Answer 58

is the study of how galaxys don't just give of visbalelight rays but rays accross the electrometic spectrum