How does sound pressure level change when moving from 30 feet to 60 feet from the source?

When moving away from a sound source, the sound pressure level decreases as the distance from the source increases. This reduction in sound level follows the inverse square law, which states that the intensity of sound diminishes with the square of the distance from the source.

In this case, when the distance changes from 30 feet to 60 feet, it doubles. According to the inverse square law, each time the distance doubles, the sound pressure level decreases by approximately 6 dB. However, since this specific scenario involves moving from one distance to another (30 feet to 60 feet), we look at the change across two doubling distances.

1. The first step is moving from 30 feet to 60 feet, which is one doubling period. This results in a decrease of 6 dB.

2. If you were to consider further reductions, such as from 60 feet to 120 feet, another 6 dB decrease would occur.

To aggregate the total change when moving from 30 feet to 60 feet only, we see that it amounts to a -6 dB change after the first doubling, which correctly relates to another reduction in sound level, leading to the total assessment of the reduction being notable over longer distances.

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