Sound:
Sound is produced by vibrations and travels in waves. Sound waves need a medium to travel through. For example a solid, a liquid or a gas.
Pitch:
Pitch refers to how high or low a sound is.
Music:
Music is a sound that produces a pleasing sensation.
Noise:
Noise is an unwanted and unpleasant sound produced by horns of vehicles, by machines etc.
Following are the three kinds of noise pollution:
• Transport Noise
• Neighbour-hood Noise
• Industrial Noise
Ways to reduce noise pollution are:
• Installing noise-reducing insulation like glass wool
• Planting more trees
• Using earplugs instead of speakers.
Sound waves need a medium to travel through but there is no medium in vacuum. That’s why sound cannot travel in vacuum.
Noise pollution is an unwanted or disturbing sound in the environment that affects the health and well-being of humans and other living things.
