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Light and Sound > Sound > Flashcards

Sound Flashcards

1
Q

What is Timbre?

A

The quality of sound or tone.

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2
Q

What is Frequency?

A

The frequency of sound is how quickly the compressions are passed on per second.

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3
Q

What is Pitch?

A

Pitch is how high or low a sound seems.

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4
Q

What is the intensity of a sound?

A

Intensity is the amount of energy it has.

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5
Q

What is the speed of sound?

A

340 meters per second. (in air)

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6
Q

Can sound travel in a vacuum?

A

No, sound needs a medium to travel through. Sound travels faster in denser mediums.

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7
Q

Why does sound travel faster in denser mediums?

A

Because in denser materials particles are closer together and can bump into each other quicker.

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8
Q

How do we measure loudness?

A

In decibels (dB)

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9
Q

Which colors are needed to create cyan?

A

Blue and green

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10
Q

Which colours are needed to create magenta?

A

Blue and red

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11
Q

Which colours are needed to create yellow?

A

Red and green

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12
Q

What are the primary colours of light?

A

Red, green and blue

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13
Q

What are the secondary colours of light?

A

Cyan, magenta and yellow

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14
Q

Describe the process of how sound travels through your ear

A
  1. Outer ear (PINNA) collects sound waves
  2. Sound is amplified as it travels down the ear canal to ear drum
  3. Sound waves cause the ear drum to vibrate, this makes the malleus (‘HAMMER’) vibrate.
  4. The vibration is passed down to the incus (“ANVIL”)
    then to the staples.
  5. When the stapes (“STIRRUP”) move, it causes a fluid in the cochlea to move.
  6. Nerve endings in the CHOCHLEA convert the vibrations to an electric signal.
  7. The signal travels along the AUDITORY NERVE and into the brain. The brain helps us hear the impulse as sound.
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15
Q

What is refraction?

A

Refraction is the bending of light rays as they move from one medium to another. This occurs because the speed of light changes when the rays change mediums.

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16
Q

What is refractive index?

A

The speed of light in a medium.

17
Q

What is the incident ray?

A

The light ray moving toward the border between two mediums.

18
Q

What is the refracted ray?

A

The ray that has entered the second medium.

19
Q

What is the angle of incidence?

A

The angle between the normal and the incident ray.

20
Q

What is the angle of refraction?

A

The angle between the normal and the refracted ray.

21
Q

What happens when light enters an optically denser medium?

A

Light rays slow down and bend inwards, TOWARDS the normal. e.g: air to glass.

22
Q

What happens when light enters an optically less dense medium?

A

Light rays speed up and bend AWAY from the normal.

23
Q

What happens when light enters at a right angle?

A

The light ray changes speed, but not direction.

24
Q

What happens when light enters a medium of the same density?

A

The light does not bend.

25
Q

What is a converging lens?

A

A biconvex lens is a converging lens. They are thicker in the middle than the edge. Light rays go through the lens and MEET at a focal point.

26
Q

What is a diverging lens?

A

A biconcave lens is a diverging lens. It is thicker in the edges than at the middle. The rays of light go through the middle and then spread out. The light appears to come FROM a focal point behind the lens.

27
Q

Describe how light travels through the eye

A
  • Light rays enter the eye through the cornea
  • The cornea’s refractive power bends the light rays so they pass freely through the pupil (an opening in the center of the iris)
  • then the light rays pass through the eye’s natural crystalline lens, which shortens or strengthens its width in order to focus the light ray on the retina
  • The retina receives and transforms this image into electrical impulses that are carried by the optic nerve to the brain.
28
Q

Dispersion

A

the separation of white light into colours

Light and Sound (1 decks)

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