Waves

Question 1

what’s an example of a transverse wave

Answer 1

ripples on the surface of the water

Question 2

example of a longitudinal wave

Answer 2

sound waves travelling in air

Question 3

does all wave transfer energy from one place to another

Answer 3

yes

Question 4

what’s the definition of a transverse wave

Answer 4

the oscillations are perpendicular to the direction of energy transfer ( right angle)

Question 5

longitudinal wave

Answer 5

the oscillations are parralell to the direction of energy transfer

Question 6

does transverse waves or longitudinal waves move up and down

Answer 6

transverse

Question 7

do longtitudinak waves move from side to side

Answer 7

yes

Question 8

what do all longitudinal waves require to travel and does a transverse wave require it

Answer 8

A medium

No

Question 9

are waves always reflected

Answer 9

no

Question 10

what are the 3 things that can happen when a wave arrives at a boundary

Answer 10

1) wave may be absorbed by the material and the energy transfers to the energy store of the material

2) waves can be transmitted ( carries on travelling to the other side)

3) waves can be reflected off the surface

this depends on wavelength and the properties of the 2 materials

Question 11

what does the angle of incidence always equal to

Answer 11

the angle of reflection

Question 12

what must you always remember when drawing ray diagrams

Answer 12

always remember to draw arrows

Question 13

what is specular reflection

Answer 13

flat boundary (mirror)

normals are in the same direction

light reflected in the same direction

Question 14

what is scattered reflection

Answer 14

rough boundary
normals will all be different therefore light will be reflected in all different directions

Question 15

what happens to waves when they change speed

Answer 15

change direction moving from one medium to another

Question 16

what happens when a waves speed decreases

Answer 16

bends towards the normal

Question 17

what happens when waves pass from the glass back to the air

Answer 17

velocity increases therefore they bend away from the normal

Question 18

what’s a wavefront

Answer 18

imaginary line that connects all th same points in a set of waves

Question 19

what happens when sound waves move through air

Answer 19

the air particles ossilate from side to side

Question 20

can sound waves pass from one medium to another

Answer 20

yes
example , from air to a solid

Question 21

what happens to the human ear when sound hits it

Answer 21

sound waves in the air are funnelled into the ear where they hit the ear drum

Question 22

what is an ear drum

Answer 22

a thin membrane

Question 23

what do sound waves cause the ear drum to do

Answer 23

vibrate

Question 24

what do sound waves trigger

Answer 24

oscillations

this only works in a limited range of frequencies

Question 25

what is the human hearing range

Answer 25

20 Hz - 20,000 Hz

Question 26

what’s the equation for wave speed

Answer 26

wave speed = frequency x wavelength

Question 27

what happens when wave speed increases

Answer 27

wavelength also increases frequency does not change when a wave changes medium

Question 28

what does a high frequency lead to

Answer 28

high pitch

Question 29

does a small amplitude mean a louder or quieter sound

Answer 29

quieter

Question 30

what are electromagnetic waves

Answer 30

transverse waves that transfer energy from the source to an absorber

Question 31

what are an example of electromagnetic waves

Answer 31

Microwaves transfer energy from the source( the oven) to an absorber (food)

Question 32

what happens when a white light is shined on a prism

Answer 32

all the colours will reflect

Question 33

what happens to the frequency and wavelength as you go down the rainbow starting from red

Answer 33

the frequency increases the wavelength decreases

Question 34

what colour has the lowest frequency

Answer 34

red

Question 35

what is the electromagnetic spectrum

Answer 35

radio waves microwaves infrared radiation visible light ultraviolet x rays gamma rays

Question 36

what happens to the frequency as you go down the spectrum

Answer 36

frequency increases and wavelength decreases

Question 37

what is the only light that the human eye can detect

Answer 37

visible light all the colours int he rainbow

Question 38

If light passes through the centre of the lens does the direction change

Answer 38

No

Question 39

what are concave lens

Answer 39

correct short sightedness by spreading the light further

Question 40

what are convex lenses

Answer 40

correct long sightedness by focusing the rays closer to the

Question 41

what do all objects absorb and emit

Answer 41

infrared radiation

Question 42

whag does a black body absorb

Answer 42

all the radiation it receives