# How do you calculate sound pressure with distance?

## How do you calculate sound pressure with distance?

In a free field – a doubling of the distance from a noise source reduces the sound pressure level with 6 decibel. A “free field” is defined as a flat surface without obstructions….Example – Rifle Shot and Sound Pressure at Distance.

Distance (feet) | Sound Pressure Lp (decibel) |
---|---|

1.25 | 134 |

2.5 | 128 |

5 | 122 |

10 | 116 |

## How much does sound attenuation with distance?

For every doubling of distance, the sound level reduces by 6 decibels (dB), (e.g. moving from 10 to 20 metres away from a sound source).

**How much does sound pressure decrease with distance?**

According to the inverse square law, it can be shown that for each doubling of distance from a point source, the sound pressure level decreases by approximately 6 dB.

### How far does 70 dB travel?

The (A) refers to a weighting scale that approximates the manner in which humans hear higher frequencies better than lower frequencies. Levels of highway traffic noise typically range from 70 to 80 dB(A) at a distance of 15 meters (50 feet) from the highway.

### How far can 60 dB be heard?

Distance and perception of voice.

Distance | Voice Level (dB PSIL) | |
---|---|---|

(ft) | (m) | Very Loud |

6 | 1.8 | 66 |

12 | 3.7 | 60 |

24 | 7.3 | 54 |

**How far does 120 dB travel?**

The effective distance of a 100 dB(A) sounder in a very noisy environment is 1.8m, the distance for a 120 dB(A) sounder is approx 18m (10 times the distance). Note: Alarm sounders that are too loud may be dangerous and cause panic, discomfort and make communication very difficult.

#### How far can 100 decibels travel?

If a sound is 100 dB at the source, it will be 94 dB at 1 meter, 88 dB at 2 meters, and so on. Therefore, you will generally be able to hear a 100 dB sound at a maximum of 16 meters.

#### What does 63 dB sound like?

Sound Clip Decibel Levels

Sound | Type | Decibels (dBA) |
---|---|---|

Washing machine | Specific | 63 |

Air conditioner | Specific | 63 |

Dishwasher | Specific | 63 |

Electric shaver | Specific | 65 |

**What is 70 dB sound like?**

70 decibels is as loud as a washing machine or a dishwasher. It is a moderate noise level. 70 dB noise is not considered harmful to human hearing. However, extended exposure to levels above 55-60 dB can be considered disturbing or become annoying.

## What is the formula for sound attenuation?

Sound Attenuation Calculator – Inverse Square Law. The formula to calculate sound attenuation over distance for a point source is: Lp (R2) = Lp (R1) – 20·Log10(R2/R1) Where: Lp (R1) = Known sound pressure level at the first location (typically measured data or equipment vendor data) Lp (R2) = Unknown sound pressure level at

## How do you calculate the sound pressure at a distance?

In order to determine an estimate of a sound pressure level at a distance the Inverse Square Law can be used.

**How many decibels does it take to reduce noise per meter?**

There is no noise decrease (sound reduction) or sound drop per meter. We get a sound level drop of 6 dB per doubling of distance. Sound power or sound power level has nothing to. do with the distance from the sound source.

### How do I limit the amount of sound attenuation for a barrier?

The guidance also states that barrier attenuation is limited to 20dB for a single barrier and 25dB for two barriers. Toggle this with the “Apply limit” checkbox. Sound waves are reflected or absorbed by the ground depending upon the frequency of the sound wave and how porous the ground is (indicated by the “Ground Factor” value G).