Definitions
Experiments
Sound Technology
Measuring Sound
The Human Ear
100
What is the definition of sound wave?
energy that vibrates particles as it travels through matter, sensed by the brian as sound
100
What happened to the salt and water when we hit the tuning fork on our shoes and then moved it close to the salt and water?
The sound waves caused the salt and water to vibrate.
100
Where was the first sound transferred over the Atlantic?
It came from England and was sent to Signal Hill Newfoundland
100
How do we measure sound?
Sound is measured in Decibels (dB)
100
What is the ear drum?
a thin delicate membrane in the middle ear, it vibrates when sound waves hit it
200
What is the definition of pitch?
how high or low a sound is, determined by how fast the sound wave vibrates
200
When we added water to different bottles which bottle make a high pitch sound and which bottle made a low pitch sound when we hit them with a pencil? What about when we blew over top?
Hitting a bottle with less water made a high pitch sound, hitting a bottle with more water made a low pitch sound. Blowing over the bottle with less water made a low pitch sound, and blowing a over a bottle with lots of water made a high pitch sound.
200
What two tools helped to make sound louder in 1919?
Microphones and Amplifiers
200
When does sound hurt our ears? What are some examples
Nosies as loud as 120 decibels can hurt our ears- rock concert, jet plane taking off.
200
What is the cochlea?
a shell shaped part of the inner ear that is filled with liquid and lined with thousands of tiny hairs which transmit sound signals.
300
What is the definition of Amplify?
To make a sound louder
300
What happened to our sting when we added more rocks to the bucket? How did the sounds change?
The string got tighter, it made a higher pitched sound
300
How do we listen to music today?
MP3's
300
True or false- children can hear more sounds than adults?
True
300
What do the nerves inside the inner ear do?
The hairs in the cochlea are joined to nerves that send the sound signals to your brain
400
What is the definition of Echo?
a sound that bounces off an object and reflects back to the ear
400
How could you make a very loud howler and a very quiet howler?
A larger container makes a loud sound, a smaller container makes a quieter sound. A thicker string makes a lower pitched sound
400
What is an ultrasound machine?
A device that uses high-pitches sound waves to take a picture through a persons skin
400
What is an animal that can hear a higher pitch than humans can?
Bats, Dolphins, Dogs
400
What happens when the tiny hairs in the cochlea are damaged by too much vibration (too loud of a sound) ?
Any sound that is too loud, or too close can damage your hearing and cause hearing loss.
500
What is the definition of insulate?
to absorb
500
What type of materials did sound travel through the best? Which materials reflect the most sound?
Sound traveled through solids the best, especially those with smooth surfaces Soft materials reflected the most sound
500
What does a megaphone and ear trumpet do? What shape work the best for both?
Megaphone- makes a sound louder by concentrating it and directing it to a certain spot. Ear Trumper- makes it easier to hear sounds by collecting them and directing them to the ear The longer, more narrow shapes works best for both because it focuses the sound more.
500
Which animals uses very low pitch sounds to talk? (so low that humans can't hear them!)
Elephants
500
How many decibels is a normal talking voice?
60 decibels.
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