Kelas 4 Semester 1 Sekolah Dasar
Sound
▪ Sound happen when the things or object Vibrate
▪ The states of sound travel medium or can travel thourgh...
- the solid material —›
(the best travel because in a fixed position)
- the gases (air) —› the
worst travel
- the liquids (water) —› better
than the air
The conditions when a medium to travel = Vacuum —› and no
particle to travel sound
▪The steps of hearning process the sound travel to our ears
Sound —› Ear Canal —› Ear Drum —› Tiny-tiny Malleus —› Incus —› Stapes —›
Cocholea —› Auditory Nerve
▪ How to make Loud
sound Soft sound
a. Guitar Puckling hardly
Puckling gently
b. Drum Hit
hardly Hit gently
c. Recorder
Blown hardly Blown gently
⋆ Several types of musical intruments
- Bowed = Violin , Rebana
- Blown = Pianica , Saxophone , Recorder
- Plucked =
Guitar , Harp
- Hit
= Drum
▪ How to make High
sound Low sound
a. Harp Plucking
short string Plucking
long string
b. Drum Tight
drum skin loose
drum skin
c. Guitar Plucking thin string Plucking thick string
⋆ High sound produce more
vibration and more frecuency
▪ Muffle Sound = The material that obsorb the sound
Example = Fabric , sponge , towel
When we make fair compairsons of whether the sound is
muffledor not, we use one layer of each material.
▪ Instument to measure the loudness sound = soundmeter
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