Waves

Question 1

What is a wave

Answer 1

a transfer of energy from one place to another without the transferof matter

Question 2

what is the substance energy passes through called

Answer 2

the meidium

Question 3

what is equilibrium position

Answer 3

where particles are normally found when no energy is passing through the medium

Question 4

what do we see as a wave

Answer 4

The viabration of particles in medium

Question 5

how do particles vibrate in a transverse wave

Answer 5

perpendicular

Question 6

what are crests and troughs

Answer 6

Highest and lowest points of particles vibration

Question 7

examples of transverse wave

Answer 7

Light, earthquake s waves

Question 8

how do particles vibrate in logitudinal waves

Answer 8

paralell to the direction of motion

Question 9

what are compressions and rarefactions

Answer 9

where particles are close together ,where particles spread far apart

Question 10

logitudinal wave examples

Answer 10

sound waves,earthquake p waves

Question 11

what is amplitude

Answer 11

maximum displacement of particles from equilibrium position

Question 12

is amplitude the same in both directions

Answer 12

yes vibration is symetrical

Question 13

what is wavelength

Answer 13

distance between two succesive particles undergoing same motion

Question 14

what is period

Answer 14

time taken for one complete wave to pass a point measured in seconds

Question 15

what is frequency

Answer 15

the number of complete waves that pass a point per second measured in hertz (Hz)

Question 16

what is wave speed

Answer 16

how fast energy travels through a medium

Question 17

what is reflection

Answer 17

when waves hit a surface and bounce off

Question 18

how does an echo form

Answer 18

when sound waves are reflected by large hard surfaces the reflected sound can be heard as an echo

Question 19

what is a ray

Answer 19

an arrow drawn representing the direction in which energy is being transferred in a wave

Question 20

where does energy go in reflection

Answer 20

-some bounces off
- some enters the medium

Question 21

when a wave is reflected what decreases

Answer 21

the amplitude

Question 22

where is the normal

Answer 22

90 degrees from the surface

Question 23

where are angles of incidince/reflection measured

Answer 23

between ray + the normal

Question 24

what is the law of reflection

Answer 24

angle of incidence=angle of reflection

Question 25

how do reflected rays travel

Answer 25

smooth level surface=regular paralell reflection, uneven surfae- difuse reflection ( range if directions)

Question 26

what is a plane mirror

Answer 26

flat mirror

Question 27

what happens when light reflects off a plane mirror

Answer 27

an image of the original object is formed in the mirror- same size same distance inverted

Question 28

what is refraction

Answer 28

the change of speed of a wave as it enters a new medium

Question 29

what direction will a slowing down wave turn

Answer 29

bend towards the normal

Question 30

what direction will a speeding down wave turn

Answer 30

bend away from the normal

Question 31

does water waves travel faster in deep water or shallow

Answer 31

deep water

Question 32

what is optical density

Answer 32

the speed of light in a transparent medium

Question 33

what does the value of the refractive index tell you

Answer 33

the higher the value the slow waves travel

Question 34

what are the units for refractive index

Answer 34

there is none but the symbol is n

Question 35

refractive index in air =

Answer 35

1

Question 36

snells law is?

Answer 36

when light travels fro air to another medium
n=sin I divided by sin r