What is 3dB rule?

The basic rules for working with decibels Change in dB. Change in sound energy. 3 dB increase. sound energy is doubled. 3 dB decrease.

What happens to the intensity of the sound when the distance traveled doubles?

As a sound wave carries its energy through a two-dimensional or three-dimensional medium, the intensity of the sound wave decreases with increasing distance from the source. So if the distance from the source is doubled (increased by a factor of 2), then the intensity is quartered (decreased by a factor of 4).

What is 6db rule?

6 dB Rule- Doubling the distance between a transmitter and receiver will decrease the received signal by 6 dB. Halving the distance between a transmitter and receiver will increase the received signal by 6 dB.

How many decibels (dB) is too much noise?

Then a “3-dB exchange rate” formula is applied, which means that for every 3 dB above 85 dBA, the maximum exposure time is cut in half. Noise levels above 140 dB are not considered safe for any period of time, however brief. For children, the World Health Organization (WHO) recommends no exposure above 120 dB.

How much noise is too much noise to be safe?

Noise levels above 140 dB are not considered safe for any period of time, however brief. For children, the World Health Organization (WHO) recommends no exposure above 120 dB. Maximum Recommended Noise Dose Exposure Levels

What are the recommended settings for a noise dosimeter?

A noise dosimeter requires the following settings: (a) Criterion Level: exposure limit for 8 hours per day five days per week. Criterion level is 85 dBA for many jurisdictions, 90 dBA for Quebec and 87 dBA for Canadian federal jurisdictions.

What is the maximum recommended noise dose exposure levels?

Maximum Recommended Noise Dose Exposure Levels Noise Level (dBA) Maximum Exposure Time per 24 Hours 97 30 minutes 100 15 minutes 103 7.5 minutes 106 3.7 minutes