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Year 8_Science > Physics Unit 4 - Light vs Sound > Flashcards

Physics Unit 4 - Light vs Sound Flashcards

1
Q

What is light?

A

Type of electromagnetic wave that travels at light speed

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2
Q

What is light speed?

A

3 x 10^8

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3
Q

What is the EM spectrum

A

Continuous spectrum of electromagnetic waves/ radiation with different properties

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4
Q

What are the properties of EM waves

A

Frequent
Ionising ability
Wavelength

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5
Q

What waves make up the EM spectrum?

A

Radio waves
Microwaves
Infra red
Visible light
UV radiation
X rays
Gamma rays

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6
Q

Properties of EM waves?

A

Travel in a vacuum
Travel at light speed
Transverse waves
Can be plane polarised
They can be reflected, refracted and diffracted
They can have interference patterns

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7
Q

What are the properties of a sound wave?

A

Is it us a longitudinal wave, oscillations are parallel to direction of energy transfer, it can not travel through a vacuum.

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8
Q

In what material will a longitudinal wave travel quickest and why?

A

In dense materials sound waves can move quicker because there are more particles to bounce off.

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9
Q

Radio waves

A
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10
Q

Microwave

A
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11
Q

Infra red

A
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12
Q

Visible loght

A
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13
Q

UV

A
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14
Q

X-ray

A
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15
Q

Gamma ray

A
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16
Q

What is amplitude of a wave?

A

Maximum displacement from the mean point.

17
Q

What is a wavelength

A

Distance between two successive identical points on a wave.

18
Q

What is frequency?

A

The number of oscillations per unit time.

19
Q

What is the displacement of wave

A

It is the distance any point on the wave has moved from mean or rest position.

20
Q

What determines the pitch of the wave?

A

Frequency

21
Q

What does the amplitude of the wave determine?

A

The volume of sound.

22
Q

What is the normal human hearing range of sound waves?

A

20 herts

23
Q

What is super position of waves?

A

When two waves meet travelling in opposite directions producing a resultant wave with the displacement that is the sum of the individual wave.

24
Q

What is the structure of the ear?

A

Ear/pina/auricle
Auditory canal - carries sound vibrations
Tympanic membrane - sound waves vibrate
Malleus + incus + stapes - transmit sound wave vibrations from the eardrum to the cochlea
Cochlea - converts sound into neural signals1

25
Q

What is the normal hearing range?

A

20 hertz - 20000 hertz

26
Q

Why does long exposure to loud sounds damage your hearing?

A

Over work the ossicles so they become stiff
Damage the cochlea by over stimulating
Damage to the eardrum

27
Q

Law of reflection

A

Angle of incidence = angle of reflection

28
Q

What is refraction?

A

Refraction occurs when a wave changes direction as it passes one medium to another.

Year 8_Science (4 decks)

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