science

Question 1

what is a wave?

Answer 1

the transfer of energy without matter

Question 2

what are the 2 types of waves

Answer 2

longitudinal and transverse

Question 3

what is a longitudinal wave

Answer 3

a wave that’s energy goes back and forth.

Question 4

what is a transverse wave

Answer 4

a wave that’s energy goes up and down

Question 5

what type of wave is a light wave.

Answer 5

tranverse

Question 6

what is the wave length

Answer 6

1 peak + 1 trough, 2 peaks or 2 troughs

Question 7

what is the wavelength unit of measurement

Answer 7

lambda

Question 8

what is the peak of a wave

Answer 8

the highest part of a wave

Question 9

what is the trough of a wave

Answer 9

the lowest part of the wave

Question 10

what is the amplitude of a transverse wave

Answer 10

the height of the crests above the middle position

Question 11

what is frequency

Answer 11

frequency is the number of something in a unit of time

Question 12

what is hertz/hz

Answer 12

the number of waves per second

Question 13

when a longitudinal waves are very close together they are called:

Answer 13

compressions

Question 14

when a longitudinal waves are very far from each other they are called:

Answer 14

rarefactions

Question 15

wavelength in light determines

Answer 15

colour

Question 16

amplitude in light determines

Answer 16

brightness

Question 17

wavelengths are measured in

Answer 17

metres

Question 18

v in the wave equation is

Answer 18

velocity/speed in metres per second

Question 19

f in the wave equation is

Answer 19

the frequency in hz

Question 20

lambda in the wave equation is

Answer 20

the wavelength in metres

Question 21

the wave equation shows the

Answer 21

speed of a wave

Question 22

the wave equation is

Answer 22

v=flambda

Question 23

time period is

Answer 23

T=1/f

Question 24

the time period is measured in

Answer 24

seconds

Question 25

hz =

Answer 25

1/second

Question 26

heat transfer occurs in three ways

Answer 26

conduction convection radiation

Question 27

what is conduction

Answer 27

this happens through the vibration of the heat particles that vibrate ,more in turn.

Question 28

what is convection

Answer 28

due to the heat higher vibration, it moves cold air out of the way and quickly fills the room

Question 29

what is radiation

Answer 29

using heat waves to transfer heat WITHOUT OTHER PARTICLES

Question 30

state the temperature on the Fahrenheit celsius and Kelvin scales at which water freezes

Answer 30

0c 32fahrenheit 273kelvin

Question 31

the speed of sound through air at 0 degrees c in metres per second

Answer 31

331

Question 32

the speed of sound through air at 18 degrees c in metres per second

Answer 32

342

Question 33

the speed of sound through water in metres per second

Answer 33

1440

Question 34

the speed of sound through wood in metres per second

Answer 34

4500

Question 35

the speed of sound through steel in metres per second

Answer 35

5100

Question 36

the speed of sound through glass in metres per second

Answer 36

5200

Question 37

how many Australians have a hearing disability

Answer 37

1 mil

Question 38

light is a form of what energy

Answer 38

electromagnetic radiation

Question 39

when light hits a surface it may:

Answer 39

be transmitted, reflected or absorbed.

Question 40

what is a translucent material

Answer 40

some light reflected, and some light passed through.

Question 41

what is a transparent material

Answer 41

almost all light is transmitted through the substance. a clear image can be seen through it.

Question 42

what is a opaque material

Answer 42

light is either reflected from or absorbed into the substance, and no light is transmitted. no image can be seen through it.

Question 43

what is diffuse reflection

Answer 43

the surface of the objects are quite rough when viewed up close. these surfaces reflect light in many directions, and do not form an image.

Question 44

what is the law of reflection

Answer 44

angle of incidence(i) = angle of reflection(r)

Question 45

what is refraction

Answer 45

the light bending due to warped glass

Question 46

what is a convex lens

Answer 46

a lense that bulges outwards

Question 47

what is a concave lens

Answer 47

a lense that bulges inwards

Question 48

what is a real light ray

Answer 48

a image that forms when light rays cross

Question 49

what is a virtual light ray

Answer 49

a image that forms when light rays appear to cross but don't.

Question 50

what is the law of refraction

Answer 50

n_1 \sin \theta_1 = n_2 \sin \theta_2

Question 51

what is the depth illusion

Answer 51

when part of the refraction of your eyes is reflected and it seems as if something is closer than it actually is