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Which travels faster, sound or light?
Light travels faster. (186,000 miles per second). Sound travels at 750 miles per hour.
How is sound produced?
Sound is produced through vibrating objects in a medium (material).
Vibration
The rate of vibration is related to the pitch of the sound. The faster the vibration, the higher the pitch.
In outer space, there are no sounds. Why?
Sounds need something to travel through. In space there is no matter; it is completely empty.
What medium does sound travel best?
Sound travels best through solids.
How is echo produced?
An echo happens when a sound is reflected or bounces off an object.
Volume
The loudness or softness of a sound.
How does sound travel?
* Sound is produced whenever an object
vibrates.
* Sound needs a medium (material) through
which to travel.
* Sound travels through solids, liquids, or
gases.
* Sound travels in waves.
* Sound travels faster through solids
because the molecules in solids are close
together.
* Sound can reflect from the surface of an
object creating an echo.
What is pitch?
* Pitch is the highness or lowness of the
sound.
* The pitch of a sound depends on the
frequency of the vibrations.
* The greater the frequency, the higher the
pitch; the lower the rate of frequency, the
lower the pitch.
Note 
Flashcard (30)