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Year 8 > Light and Sound ETT > Flashcards

Light and Sound ETT Flashcards

Light and Sound End of Topic Test

1
Q

How does increasing a sound waves amplitude effect the sound?

A

The volume increases.

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2
Q

What is Wavelength?

A

The length of one wave, from peak to peak or trough to trough.

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3
Q

What is frequency measured in?

A

Hz, Hertz

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4
Q

What will a wave with a high frequency sound like?

A

High pitched.

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5
Q

What will a wave with a low frequency sound like?

A

Low pitched.

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6
Q

What is it called when a sound wave gets reflected?

A

Echo

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7
Q

Why are Echo’s always quieter than the original noise?

A

Some of the sound waves energy is absorbed into the surface of the material that the wave is bouncing off.

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8
Q

What is echo location?

A

Using the time it takes an echo to be received to calculate the distance from a surface.

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9
Q

Through which state does sound travel fastest?

A

Solid.

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10
Q

Why does sound travel faster in water than in air?

A

The particles in water are closer together so it takes less time for each particle to transfer its energy to the next one.

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11
Q

Name the 2 types of wave.

A

Transverse, Longitudinal

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12
Q

In what direction do the particles oscillate in a transverse wave?

A

At 90 degrees to direction of the wave.

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13
Q

In what direction do the particles oscillate in a Longitudinal wave?

A

Parallel to the direction of the wave.

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14
Q

What type of wave is a sound wave?

A

Longitudinal

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15
Q

What causes a sound wave?

A

A vibration

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16
Q

Why cant a sound wave travel through a vacuum?

A

There are no particles to transfer the energy.

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17
Q

What do all waves transfer?

A

Energy

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18
Q

What is the speed of sound in air?

A

340 m/s

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19
Q

Why do you see the flash of a firework before you hear the BANG!?

A

Light travels much faster then sound.

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20
Q

Which part of the ear moves first when receiving a sound wave.

A

The ear drum.

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21
Q

What is an echo?

A

A reflected sound wave.

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22
Q

What is ultra sonic?

A

A sound with a frequency above 20 000 Hz

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23
Q

What equation can you use to find the distance a sound wave has travelled?

A

Speed (m/s) = Distance (m) / Time (s)

24
Q

Describe a low pitched loud sound wave.

A

A wave that has a large amplitude and a low frequency.

25
Q

Describe a high pitched quiet sound wave.

A

A wave that has a low amplitude and a high frequency.

26
Q

What is the name of this part of the ear?

A

Auditory canal

27
Q

What is the nam of this part of the ear?

A

Ear Drum

28
Q

What is the name of this part of the ear?

A

Ossicles

29
Q

What is the name of this part of the ear?

A

Semi-Circular Canals

30
Q

What is the name of this part of the ear?

A

Cochlea

31
Q

What is the name of this part of the ear?

A

Auditory nerve

32
Q

Define Luminous

A

Something that gives out light

33
Q

Define Non Luminous

A

Any object that does not give out light.

34
Q

How do we see non luminous objects?

A

Light reflects of of the object and into our eyes.

35
Q

Define Transparent

A

Materials that allow light to pass through easily, the material does not absorbe very much of the light energy.

36
Q

Define Translucent

A

A material that allwos light to pass through but scatters the direction og the light so that you do not see a clear immage.

i.e frosted glass

37
Q

Define Opaque

A

A material that does not let light pass through.

38
Q

How does light travel?

A

Light travels as a wave.

39
Q

Name the muscle that controls the size of your pupil.

A

Iris

40
Q

Name the two types of photo receptor in your eye.

A

Rods and Cones

41
Q

What is the name of the back of the eye where immages are recieved?

A

Retina

42
Q

What is white light made up of.

A

Aspectrum of coloured light.

43
Q

What piece of equipment can be used to separate white light?

A

Prism

44
Q

Name the two types of reflection.

A

Specular reflection

diffuse reflection

45
Q

What type of reflection gives a clear immage.

A

Specular reflection

46
Q

What type of reflection do you get from a rough surface?

A

Diffuse reflection.

47
Q

What is the Law of reflection?

A

Angle of Incidence = Angle of reflection

48
Q

Define refraction.

A

Light changing direction as it travels through a medium with a different density.

49
Q

Name the two types of Lens.

A

Convex and concave

50
Q

What is the name of the point where rays of light converge behind a lens.

A

Focus or focal point.

51
Q

Why does the grass look green.

A

White light from the sun hits the grass all of the coloures of the spectrum of light are absorbed by the grass execpt for green light which is reflected.

52
Q

H

A
53
Q

How do light filters work?

A

They only transmit the same colour of light that they are and absorb the rest.

54
Q

How far behind a mirror does an object appear?

A

The same distence as the object is infront of the mirror.

55
Q
A

Year 8 (5 decks)

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