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Science > Sound and Light > Flashcards

Sound and Light Flashcards

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Biology 101 flashcards
1
Q

Medium

A

A substance through which a wave can travel

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2
Q

Media

A

Consists of any solid, liquid, or gas, but not a vacuum

Air, water, metal, glass, stone

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3
Q

Protect your ears

A

Relocating further away from the sound source
Wear ear plugs
Turn down volume

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4
Q

Long string vs short string

A

Long produces anlower fundamental note

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5
Q

Sound Quality

A

Blending of pitches through interference

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6
Q

Amplitude

A

Determines the loudness

Greater amplitde - louder the aound

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7
Q

Loudness

A

How well a sound can be heard

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8
Q

Pain from sound

A

Starts at 120 decibels

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9
Q

What determines pitch?

A

Frequency of a sound wave

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10
Q

Hertz

A

Measure of frequency

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11
Q

Ultrasonic sounds

A

Sounds above the highest frequency we can detect

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12
Q

Ultrasonic sounds for humans

A

Above 20,000 Hz

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13
Q

Doppler Effect

A

Due to the relative motion of either the sound source or the listener.

Front of the source - pitch is higher as it moves towards you

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14
Q

Echo

A

Reflected sound wave

Usually as it bounces off a hard surface

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15
Q

Person experiences a sonic boom

A

Shock wave reaches the ear

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16
Q

Parts of ear

A

Ear drum
Middle ear
Cochlea

17
Q

Ear drum

A

Membrane divides outer ear from middle ear

Sound must pass through ear drum

18
Q

Middle ear

A

Three bones - anvil, hammer, stirrup

These increase the size of vibrations

19
Q

Cochlea

A

Spiral sea shell shape
Filled with liquid
Tiny hairs

Movement of hairs send electrical signals to brain

20
Q

Speed of sound

A

Varies from one medium to another

21
Q

Oscilloscope

A

Graphic representation of a sound wave

Ratefactions - troughs
Compressions - crests

22
Q

Vibrations

A

Complete back and forth motion of an object

23
Q

Sound waves

A

Longitudinal waves that are caused by vibrations

Carried through a substance and transfers energy

24
Q

Sound

A

Transmitted through vibrations and collisions of the particles

25
Q

Sound wave travel

A

Away from source

In all directions

Science (4 decks)

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