Sound Flashcards
1
Q
Sound is produced by
A
Vibrations(vocal cords,air molecules,ear drum)
2
Q
Sound can travel through a
A
A medium e.g solid,a liquid or gas
3
Q
Sound cannot travel through a
A
Vacuum (no air therefore it needs a medium to travel through
4
Q
Sound
A
Is a form of energy
5
Q
The speed of sound in air
A
Is 341m/s,light is 300,000,000m/s 3x10.8 m/s
6
Q
An echo
A
Is a reflection of sound
7
Q
Ultrasound
A
Is sound above our level of hearing
8
Q
If people are working in a job where sound is above 70db(decibels)
A
They have to wear ear protection(busy street traffic
9
Q
Sound above 115db can cause
A
Permanent damage (speakers at a nightclub are 120db)
10
Q
The loudness of a sound
A
Is called sound intensity level
11
Q
A sound level metre
A
Is used to measure the loudness of a sound in decibels
