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Science Unit 2 Lesson 1 and Unit E, Ch.3
Terms in this set (42)
series of vibrations that can be heard
measure of sound energy reaching your ear
area where air is pushed together by vibrations
sound wave made by an object moving faster than the speed of sound
a repetition of specific sound produced by reflection of sound waves from a surface
a wave that transfers sound through matter by spreading out from a vibration
speed of sound
rate of travel of a sound wave
the highness or lowness of a sound as determined by its frequency
a measure that relates to the amount of energy in a sound wave
the distance from the top of one wave to the top of the next
a back-and-forth motion
the number of wave lengths that pass a certain point in an amount of time
the loudness or softness of a sound
What is an example of how sound waves travel?
a marble being dropped in water
Your brain interprets signals from _________________.
tiny hairs that affect nerve cells as sounds
The pitch of a stringed instrument can be affected by _________________.
the length of its strings
If a sounds pitch is high, its source is ___________________.
What is an example of a place where an echo will sound most like the original sound?
If you shout in a long hallway
What is a sonic boom caused by?
An object moving faster than the speed of sound
The farther away you are from the source of the sound, the ___________________ it sounds.
Why can you see a plane before you hear it?
because the speed of light (which enables you to see the plane) is faster that the speed of sound
Why does cupping your hands around your mouth when you shout make the sound travel faster?
because cupping the hands directs that sound waves
Sound waves travel _____________________.
away from the object in all directions
The part of a wave diagram that demonstrates the areas of high pressure are the _________________.
The part of a wave diagram that demonstrates the areas of low pressure are the _________________.
What are the three main parts of the human ear?
How do sound waves travel?
at different speeds in different materials.
What affects how sound waves move?
The arrangement of particles in materials
How can sound waves travel?
in a straight line
All sound begins with _________________.
Does sound travel faster in a solid, liquid or gas?
Sound travels fastest in a solid and slowest in a gas
Sound cannot travel through a vacuum. Why?
because a vacuum does not contain matter
What are the body parts, in order, that vibrate when a sound wave enters the other ear?
bones of the middle ear
fluid and hair cells in the inner ear
What is the first thing that happens when sound waves reach the ear?
The outer ear funnels the sound waves directing them to the middle ear
Shorter, thinner, or tighter guitar strings will vibrate more quickly so the sounds have a ______________ pitch
Amplitude affects the ___________ or ____________ of sound
volume or loudness
Sonar is a technology that uses sound waves to detect ___________.
How does sonar work?
by sending out sounds and receiving echoes
How do we use sonar?
Sailors use sonar to measure how deep the water is;
Fisherman use sonar to find schools of fish;
Scientists use sonar to map the ocean floor
What does sonar stand for?
Based on pictures of wave diagrams, tell if the sound would be high in pitch or low in pitch
Based on pictures of wave diagrams, tell if the sound would be loud or soft
Low Sound (Soft)
High Sound (Loud)
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