Page 2 :
Sound, , © Sound is a vibration that propagates as, a mechanical wave of pressure and, displacement, through some medium, (i.e. air or water)., , © Sound refers to only those vibrations, with frequencies that are within the, range of hearing for human.

Page 3 :
Noise, , > Noise is basically any unwanted sound., > It is measured in GB units., , , , Sound

Page 4 :
TYPES OF NOISE, , There are four types of noise which are following:, , “Continuous Noise: It’s noise that is produced continuously by, , machinery that keeps running without interruption., , Intermittent Noise: is a noise level that increases and decreases rapidly., This might be a freight train passing by, factory equipment that operates, , in cycles or aircraft overhead.

Page 5 :
TYPES OF NOISE, , Impulsive Noise is most commonly associated with the construction, and demolition industry. This sudden burst of noise can startle you by, , its fast and surprising nature. Impulsive noises are commonly created, by explosions or construction equipment such as pile drivers., , “Low frequency Noise makes up part of the fabric of our daily, soundscape. Whether it’s the low background humming from power, , plants or the roaring of large diesel engines. This is also the hardest, type of noise to reduce at source, so it can easily spread for miles, , around.