Hippie Coloring Book Peace, Love and Hippies Coloring: Coloring Books Designed for Artists, Adults, Teens and Older Children (Hippie Coloring Books) (Volume 1) Grace Sure. 4.6 out of 5 stars 76. Paperback.
2.2 FACTORS AFFECTING PROPAGATION OF SOUND There are several important factors, which affect the propagation of sound: geometric spreading, atmospheric effects, and surface effects. These are discussed separately below. 2.2.1 Geometric Spreading This refers to the spreading of sound energy as a result of the expansion of the wave fronts.
Noise pollution can cause both short-term and long-term health problems. Traffic noise and excessive sound levels can disturb sleep, cause cardiovascular and psychophysiological effects, reduce performance, and provoke negative responses and changes in social behavior.