Show:
Experiments
Properties
Sources
Music
The Ear
100
In our experiment with the string and cups why were we able to hear what the person was saying on the other end?
Sound vibrations travelled through the string to the other end.
100
What causes sound?
Vibrations moving in waves.
100
Name two sounds heard in nature.
Birds, (animals), wind, water.
100
Name three different types of instruments.
String, Wind, Brass, Percussion
100
What do you call the part of your ear that we see?
The outer ear.
200
In our experiment where we scratched the rulers, why was the sound quieter when the ruler was longer?
The vibrations had further to travel (and some of the vibrations were absorbed by the ruler).
200
Why can you hear someone in another room?
Sound travels.
200
Name two sounds that are used to signal an emergency.
A horn, alarm or bell.
200
How do you make sound on a string instrument.
Plucking the strings causes the strings to vibrate.
200
Where does sound travel first in your ear?
Through the ear canal.
300
In our experiment using rulers and textbooks how did changing the length of the ruler change the pitch?
By changing the length of the rulers there could be more or less vibrations. More vibrations, lower pitch and less vibrations, higher pitch.
300
Why can the same sound be louder or quieter?
Sound can be modified.
300
Name two objects that need electricity to make sound.
Computer, CD player, MP3, video games.
300
How do you make sound on a wind instrument?
By blowing air through the instrument (causing vibrations).
300
What part of your ear picks up the vibrations?
The ear drum.
400
In our experiment on echoes, which material was the best reflector of sound and why?
The cookie tray because it is hard (solid), and smooth.
400
Why can't some loud sounds be heard from another room.
Sound can be absorbed. (Sound gets absorbed/blocked by wall).
400
Fill in the blank: Sound is a source of _____________.
Energy.
400
How do you make a sound on a percussion instrument?
By striking or hitting the instrument. When you hit them they vibrate.
400
What do the three little bones in the middle ear do?
Send vibrations to the cochlea (which are connected to nerves, which send signals to the brain).
500
When we put the tuning fork on the yogurt cup with the salt and water, why did the salt and water particles move?
The vibrations from the tuning fork moved the salt and water particles (by transfering energy to them).
500
Why do we hear echoes?
Sound can be reflected.
500
How do people make sound with their voice?
Air from the lungs moves up and passes through your voice box making vocal chords vibrate.
500
Name one way you can change the pitch of an instrument.
Create more or less vibrations. Shorter or longer strings. Wider or thinner strings. Size of instrument (more or less air). Different materials.
500
Why should you never stick objects in your ear.
It can cause damage to the ear drum.