Echoes
echoes
What two factors affect the speed of sound?
type of medium the sound travels through and the temperature of the medium
What do cell phones use to send signals?
radio waves
How is information on sound waves stored
by pressing microscopic pits into the plastic
How is sound stored in a computer?
as digital files
What is an echo?
a reflected sound wave
What also affects the speed of sound?
state of matter, fastest through solids and slower through liquids
what are phones good at doing?
changing sound waves into other types of signals that can be sent over long distances. They also change the signals they receives back into sound waves
what stores the digital signals that are used to recreate sound waves on a cd?
the spiral pattern that is formed by the pits and lands
What's an example of a digital sound file?
MP3
What are examples of animals that use echoes to hunt food?
Sound travels faster at high or lower temperatures?
higher temperatures- hot air faster than cold air
What do all telephones change sounds waves into?
electrical signals
What does a CD player use to read the information on the CD?
light
To record sound as a computer file, the original sound is changed into this
an electrical signal
What is echolocation?
The use of reflected sound waves to find objects
Sound waves reflect best of these kinds of surfaces
hard smooth surfaces
How do cordless phones work?
the handset and the base change electrical signals into radio waves that they transmit to each other.
What is a CD coated with so that light from a laser reflects as the CD rotates in the machine?
aluminum
After a digital file is created software reads the digital files and produces and electrical signal that is sent to these
speakers
What is sonar
What is reflection?
the bouncing back of a waves when the wave hits a barrier
What is the purpose of the base of a cordless phone?
To change the radio waves back into electrical signals
What is sonar?
A type of electronic echolocation that uses echoes to locate objects underwater
How do animals use echoes?
by telling how long it takes sound waves to echo back to the animal