About Sound
Sound is made up of what? Hint: happens when you hum
When a lot a waves happen in a second
High Frequency
What do sound waves do for humans?
Allow us to hear
What do bats and dolphins use to locate objects?
Where sound doesn't travel
How loud or quiet a sound is
Volume
What are ultrasound waves?
Frequencies above 20,000 Hz
How do humans receive sound waves
Besides locating objects, what do animals use sound for
Detecting danger
The thing that makes the loudest natural sound on earth
How high or low a sound is
Pitch
What are infrasound waves?
Frequencies below 20 Hz
What mediums can sound travel through?
Gases, liquids and solids
True or False: Echolocation only tells the distance of the object
False! Echolocation also tells the direction
Can dogs hear frequencies higher or lower than humans?
Higher
The number of waves that pass in a second
Frequency
When a lot of waves happen in a second
High frequency
Does sound travel faster through air or water?
Water
True or False: Bats are born knowing how to use echolocation
True
Based on answer from Sound Waves 400, how much faster does sound travel through the faster medium?
4x as fast as air because particles are closer together
The frequencies humans can hear
20-20,000 Hertz
When few waves happen in a second
Low frequency
What is the height of a sound wave called? This one is tricky!
Amplitude
Since the sound bats make is too high for humans to hear, what kind of sound waves are bats making?
Ultrasound waves
How fast does sound travel in air?
767 mph