a word for "where something comes from"
source
can sound travel through materials?
Yes
What are the main part of different materials to travel sound?
solids /liquids/ gases
Which materials is the best to travel sound?
solids
Look at the picture and answer.
air(soft)/water (louder) / wood (loudest)
How to travel sound?
vibrations
a word for "move from the vibrating object through materials".
vibrations
What can make vibrating objects?
sounds
a word for " how loud or soft sound".
volume of sound
what can cause large vibrations?
loud sounds
What is the unit for measuring sound?
decibels(dB)
Which instrument have to use to measure sound?
a sound level meter
To muffle the sound of car's engine, which equipment does we need to use?
silencer
Not to damage ears, what things we need to use?
ear defenders
a word for " to make sounds less and less clear".
muffle
Which materials are good for muffling sound?(hard or soft materials)
soft materials (eg. carpet/curtains)
