Sound Flashcards
1
Q
Sound is produced by…
A
Vibrations (vocal cords, air molecules, ear drum)
2
Q
Sound can travel through a…
A
Medium e.g. solid, a liquid or a gas.
3
Q
Sound cannot travel through a
A
Vacuum (no air) therefore it needs a medium to travel through
4
Q
Sound
A
A form of energy
5
Q
The speed of sound in air
A
Is 340m/s, light 300,000,000 m/s
6
Q
Echo
A
A reflection of sound
7
Q
If people are working in a job where sound is above 70db (decibels)
A
They have to wear ear protection (busy street traffic)
8
Q
Sound above 115db can cause…
A
Permanent damage (speakers in a nightclub are 120db)
