sound:
it is a form of energy that reproduce due to the vibration of an object causing the sensation of hearing.
- the sound stops when the vibrating body stops its vibration
- Sound travels through gases (air).
- Sound travels through liquids (water)
- Sound travels through solids.
How does the sound travel through the air?
- When the body vibrate, the molecules of the air become very close to each other forming compressions.
- When the molecules of the air become far apart from each other rarefaction is formed, so that sound wave consists of repetition of compressions and rarefactions.
Noise pollution:
- The sound that causes disturbance and harm to the ears
Some sources of noise pollution:
- Loudspeakers.
- Car horns
- Machines of workshops and factories
Effect of noise on Human's health:
- Exhausting of vocal cords.
- Hearing weakness.
- Fatigue of the nervous system
. .
[center]
it is a form of energy that reproduce due to the vibration of an object causing the sensation of hearing.
- the sound stops when the vibrating body stops its vibration
- Sound travels through gases (air).
- Sound travels through liquids (water)
- Sound travels through solids.
How does the sound travel through the air?
- When the body vibrate, the molecules of the air become very close to each other forming compressions.
- When the molecules of the air become far apart from each other rarefaction is formed, so that sound wave consists of repetition of compressions and rarefactions.
Noise pollution:
- The sound that causes disturbance and harm to the ears
Some sources of noise pollution:
- Loudspeakers.
- Car horns
- Machines of workshops and factories
Effect of noise on Human's health:
- Exhausting of vocal cords.
- Hearing weakness.
- Fatigue of the nervous system
. .
[center]