Wrong sound at the wrong place leads to noise pollution and is responsible for many physiological and psychological problems. The intensity of sound is measured in decibels. Based on the decibel of sound the intensity of sound is classified ranging from Silent or quiet to uncomfortable sounds. The range of Silence/Quiet is 30 dB - 50 dB and is seen in hospitals, schools, colleges, libraries, etc. The threshold of hearing is the quietest sound that can be detected by the human ear.