Lab Sci Quiz 17.3-17.4

Front 1

Destructive interference

Back 1

when the crest of one wave meets the rest position of another wave

Front 2

Refraction

Back 2

Occurs when waves enter into a new medium at an angle and part of the wave begins to move slower

Front 3

Reflection

Back 3

Occurs when waves bounce off a surface that they cannot pass through

Front 4

Sound

Back 4

Travels faster through warm air than cold air; spedd depends on the temperature of the air

Front 5

Pitch of a car horn

Back 5

is higher as it moves toward you and lower as it moves away

Front 6

Loudness

Back 6

the physical response to the intensity of sound

Front 7

Pitch of a musical note

Back 7

is determined by the frequency of the sound waves

Front 8

Doppler effect

Back 8

change in frequency and wavelength of waves occurs when the source of the waves is moving

Front 9

Higher pitch

Back 9

is produced through the use of shorter guitar string

Front 10

Resonance

Back 10

causes the air column to produce standing waves that are the same as the tuning forks

Front 11

Eletronic signals

Back 11

sound is recorded by changing sound waves into these; using a microphone

Front 12

Speed of sound

Back 12

much greater in water and metald than it is in the air because particles of the medium are much closer together; fastest in aluminum

Front 13

Amplitude

Back 13

increases when constructive interference occurs

Front 14

Node

Back 14

part of a standing wave which does not move

Front 15

Ultrasound

Back 15

sound waves above 20,000 Hz are inaudible

Front 16

Decibel

Back 16

unit of sound intensity

Front 17

Light waves

Back 17

cannot bend around large objects because the wavelength of light is too small

Front 18

Diffraction

Back 18

the bending of light waves around an obstacle

Front 19

Outer ear

Back 19

part of the ear which collects sound

Front 20

Middle ear

Back 20

contains 3 small bones which amplify vibrations and send them to the inner ear

Front 21

Inner ear

Back 21

contains the cochlea and structures which help us keep our balance

Front 22

Cochlea

Back 22

contains small hair-like structures which change sound vibrations into electric signals

Front 23

Ear canal

Back 23

tube which focuses sound waves toward the middle ear

Front 24

Eardrum

Back 24

picks up vibrations of sound waves; divides the outer and middle ear

Front 25

Auditory nerve

Back 25

carries electric signal from inner ear to brain

Front 26

Which is faster, light or sound? Give an example

Back 26

Light is faster

Ex: thunder/lightening

Ex: you see a baseball hit before you hear it

Front 27

Decsribe how to calculate the speed of sound in the lab using tuning forks.

Back 27

1. Find the length of pipe which causes resonance.
2. Use length of pipe to find wavelength.
3. Speed=wavelength x frequency

Front 28

Describe how musical instruments produce different notes and give example.

Back 28

Change in length of string, pipe, etc. to change wavelength and frequency of standing waves.
Ex: guitar strings
longer=lower note

Front 29

Explain why sound waves can diffract through the doorway but light waves cannot.

Back 29

Sound waves have a much larger wavelength than light waves and therefore can diffract around/through larger objects/openings.

Front 30

Be able to label the parts of the ear.

Back 30

(see ear diagram)