(d) ii. i. Solve the case study below using suitable sound or noise mathematical formula in page 7: The free field noise generates from Mitsubishi diesel generator produce 110 dB(A) measured form 1 meter distance. Determine whether the employee location at 4 meter exceed the noise exposure limit of 85 dB(A). Shipyard grinder using their hand-held metal grind for cumulative of 3 hours during eight (8) hour workday. The remaining cumulative of 5 hours are used for welding activities. Noise level during grinding activities is 94 dB(A) meanwhile noise level during welding activities is 85 dB(A). Evaluate the equivalent continuous noise level, Leg.
Properties of sound
A sound wave is a mechanical wave (or mechanical vibration) that transit through media such as gas (air), liquid (water), and solid (wood).
Quality Of Sound
A sound or a sound wave is defined as the energy produced due to the vibrations of particles in a medium. When any medium produces a disturbance or vibrations, it causes a movement in the air particles which produces sound waves. Molecules in the air vibrate about a certain average position and create compressions and rarefactions. This is called pitch which is defined as the frequency of sound. The frequency is defined as the number of oscillations in pressure per second.
Categories of Sound Wave
People perceive sound in different ways, like a medico student takes sound as vibration produced by objects reaching the human eardrum. A physicist perceives sound as vibration produced by an object, which produces disturbances in nearby air molecules that travel further. Both of them describe it as vibration generated by an object, the difference is one talks about how it is received and other deals with how it travels and propagates across various mediums.
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