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Yr9physics > Light And Sound > Flashcards

Light And Sound Flashcards

1
Q

How do we see things

A

Light is reflected into our eyes

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2
Q

What part of the eye is used to bend and focus the light onto the retina

A

Lens

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3
Q

What part of the eye is coloured and changes the size of the pupil

A

Iris

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4
Q

What changes size depending on the amount of light

A

Pupil

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5
Q

Where does light and an image form on the eye

A

Retina

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6
Q

What sends the message from eye to brain

A

Optic nerve

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7
Q

What is the clear part at front of eye called

A

Cornea

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8
Q

What is refraction

A

Bending of light as it travels from one medium to another e.g. air to glass

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9
Q

When light enters a glass block at an angle does it bend towards or away from the normal (90o) line and why

A

Bends towards normal
The light is slowed down as it enters the glass block

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10
Q

What happens to light as passes through a convex lens

A

The light rays converge to a point (eg through lens in eye)

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11
Q

What happens to light rays when pass through a convex lens

A

The light rays diverge (spread out)

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12
Q

What is light dispersal

A

When light passes through a prism it splits into the different colours of light

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13
Q

What are the colours of light

A

ROY G BIV
Red Orange Yellow. Green. Blue. Indigo. Violet

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14
Q

Which colour of light bends the most and which bends the least

A

Violet light bends the most
Red light bends the least

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15
Q

White light is part of the electromagnetic spectrum .
Name order of electromagnetic spectrum from shortest wave to longest wavelength

A

Gamma. X Ray. Ultraviolet white light. Infra red. Microwaves. Radio

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16
Q

What are gamma rays used for and danger of it

A

Medicine - treat cancer
Can cause cancer

17
Q

What are x rays used for and dangers

A

Used to see bones
Danger - can cause cancer (dentist and nurses using it wear lead aprons for protection)

18
Q

What is ultraviolet light used for and dangers

A

Identifying forged notes, security identification
Sunbeds

Dangers - cause cancer

19
Q

What is infrared used for and dangers

A

Use - toasters, grills to cook food and heaters
IR beams to protect items - if beam broken alarm sounds
Night vision cameras

Dangers - can burn

20
Q

What are microwaves used for and dangers

A

Heat foods
Send signals to and from satellites
Mobile phone signals

Danger - an cause internal body heating

21
Q

What are radio waves used for

A

Transmitting radio and TV signals

22
Q

Light wave is an example of what type of wave

A

transverse wave

23
Q

The height of a wave is called?

A

Amplitude

24
Q

The bigger the amplitude (height of wave) the ———— the sound

A

Louder

25
Q

The distance between 2 waves is called the ?

A

Wavelength

26
Q

The closer the waves the —————- of sound

A

The higher the pitch of sound

27
Q

An example of longitudinal wave is

A

Sound

28
Q

What part of the ear vibrates when sound hits it

A

Ear drum

29
Q

What is the shell like part of ear called

A

Cochlea

30
Q

What makes the cochlea vibrate

A

The 3 small bones behind the ear drum

31
Q

How do signals reach brain

A

Auditory nerve

32
Q

What can sound not travel through

A

A vacuum

33
Q

What is the frequency of waves and how is it measured

A

Frequency is number of waves that pass a point in 1 second
Measured in hertz [Hz]

34
Q

If there are 10 waves passing a point in 2 seconds what is h frequency

A

Frequency = 10 /2 = 5 Hz

35
Q

Pressure - how is it calculated

A

Pressure = Force (N)/ Area (cm2)

36
Q

,what are the units for pressure

A

N/m2 Or N/cm2

Look at the units given - force in N and are in cm2 or m2

Yr9physics (1 decks)

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