13-1
What move back and forth when you place your hand on your throat and hum?
Vocal cords
True or False:
Sound waves with larger amplitudes are louder.
True
What do the sound waves have to travel through to your ear?
Matter (air)
What is the most common unit to measure sound intensity?
A decibel
Fill in the blank:
Smaller objects usually vibrate ____ than the larger ones.
Smaller objects usually vibrate faster than the larger ones.
Why can't we CLEARLY see the guitar string move when we pluck it?
It's because the string moves so fast
OR
It's because the string vibrates quickly
What on an oscilloscope picks up sound waves in the air?
A microphone
Why wouldn't you hear any sound when the rocket engine flew past you in space?
A) There is no air in space
b) Sound waves have nothing to travel through in space
Through what do we hear sounds when we swim underwater?
a liquid
What happens to a sound wave that is absorbed by the carpets and the curtains?
It just dies out.
Fill in the blank:
When something vibrates, the ____ around it vibrates, too.
When something vibrates, the air around it vibrates, too.
How do water waves move?
They move up and down
Why can't we see a reflection in the wall when light waves trike a rough wall?
It's because light waves are scattered all over.
What would happen if parts of your ear absorb sound?
You wouldn't be able to ear sounds around you.
Fill in the blank:
Materials that can _______ are materials that can transmit sounds.
Materials that can vibrate are materials that can transmit sounds.
Why is the unit "bel" not commonly used to measure sound intensity?
It is because bel is too big to be used to measure sounds.
What does an oscilloscope display on the front screen?
A picture of sound waves
Fill in the blank:
Your eardrum transmits the sound waves to the hammer, then to the anvil and the sitrrup, and finally to _____.
Your eardrum transmits the sound waves to the hammer, then to the anvil and the sitrrup, and finally to cochlea.
What does the brain do when sound waves reach the ear and make parts inside the ear vibrate?
It converts the signal so we can hear the sound
longitudinal waves
Big objects produce sound waves that are more spread out. What kind of sound waves do small objects produce?
They produce sound waves that are close together.
For transverse waves, such as water waves, the amplitude is _________ (2 words) the waves are.
For transverse waves, such as water waves, the amplitude is how tall the waves are.
What is made to vibrate when vibrations reach one of your ears?
your eardrum
What are the THREE properties of sound waves?
frequency
amplitude
wavelength
without echoes