Sound Flashcards
Define echo
Reflected repetitions
Define Medium
Different speed that can change
Define Frequency
Number of vibrations per second
Define amplitude
size of vibrations
Define pitch
Is the highness and lowness
Define Wavelength
The length and of a wave
Define sound
A form of energy
Define volume
The loudness or softness of a sound
define eardrum
part of your ear that vibrates
define vocal cords
what makes you talk and what vibrates when you talk
Sound travels best through which medium?
Solids
Legends of the Native Americans say they put their ears to the ground to find out if horses were running nearby. Explain why this occurred?
You can hear a stampede faster through solids (ground) than through the air
Which medium does sound travel the fastest? Why does this happen?
Solids because the molecules are closer together
List the four ways that sound can be produced with examples of each.
Plucking - Guitars
Rubbing - Hands
Blowing - Clarinet
Striking - drums
Label the 4 parts of a light and sound wave
wavelength
True or False?
Sound occurs when something vibrates
True
True or False?
Sound travels in waves
True
An echo is caused when an object vibrates very fast
False
Sound travels faster thru air than through steel
False - sound travels faster thru solid objects
True or False?
Volume of sound depends on how strong the vibration is
true
True or False?
The number of sound waves an object produces in a second is known as the pitch.
False
True or False?
Volume is measured in units called hertz
False
True or False?
An object that vibrates quickly has a high frequency and produces a low pitch.
False
True or False?
Elephants can hear higher pitched sounds than humans.
True
True or False?
The softer the sound, the lower the number of decibels.
True
True or False?
A diver underwater can hear an approaching boat before someone floating on the surface can.
True. Sound travels faster in solid objects than air
True or False?
The windpipe is the part of your throat that vibrates and contains the two vocal cords.
False
True or False?
A sonic boom occurs when an object travels faster than the speed of sound.
True
True or False?
Scientists can use sound to measure and map the depths of the ocean.
True
True or False?
When a sound is amplified, it is made softer.
False
Define vibrate
bounce back and forth
