50 db
90dbA for 8 hours of working.
85db
To make no noise whatsoever.
"Silent" have a nice day ^__^;
Something that is lethal that causes no noise.
The Permissible Exposure for noise according to OSHA is 90 dBA at the employee's ears, taken as an 8-hour time-weighted average. The noise source and its distance from the employee is not relevant to that, although it is important in calculating the reduction of sound intensity with distance. In addition, if an employee has an 8-hour time-weighted average noise exposure of 85 dBA or greater, the employee must be enrolled in a hearing conservation program, given training and hearing protection.
The homophone of "a noise" is "an oise" when said out loud, as "oise" is pronounced similarly to "noise", but with a silent 'n' at the beginning.
This varies and you should check with the appropriate level of government depending on where you live. In North America, the social norm is 7:00 AM to 11:00 PM but the law may be different from this.
Okapis are usually silent, but do make a sort of coughing noise. This noise is usually made when a mother and her calf are separated.
Silence is a lack of noise there would be no sound.
You can buy 'Silent Spinner'; i know they are sold at petco. they make almost no noise and really are silent. the difference is that its plastic; it doesnt get rusty like metal wheels do.
Sound level meters Loudness meters Noise dosimeter