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Sounds travel by..................
vibrations
Which material do the sounds go best through?
solid
the machine we use to measure the volume of the sound.
sound level meter
Big or small: Which drum has a high-pitched sound?
small drum
Big or small: Which drum has a low-pitched sound?
big drum
the ........... (faster / slower) the vibrations, the slower the pitch of the sound
slower
the ........... (faster / slower) the vibrations, the higher the pitch of the sound
faster
how loud or soft a sound is
volume
True or False: the volume and the pitch of the sound are the same.
False
If you have a thinner guitar's string, the pitch will be .................​ (higher / lower)
higher
If you have a thicker guitar's string, the pitch will be .................​ (higher / lower)
lower
What two factors can change the pitch of the sound of the guitar?
the length and the thickness of the strings
When we make the guitar’s string tighter (căng hơn), ​ we ............ (increase / decrease) the pitch of the sound. ​
increase
Give one example of percussion instrument
done
Give one example of string instrument
done
where something come from.
source
Things that can change the result of an investigation (f __ __ __ __ __ __)
factors
Picking up a string with your finger and letting it go ​(P__ __ __ __)
pluck
the unit we use to measure the volume of sound (dB)
decibel 
to move from one place to another. 
travel 
to shake very quickly back and forth
vibrate
a very small movement backwards and forwards
vibration
to make sounds softer and less clear.
muffle
how high or low a sound is. 
pitchÂ