Source: https://guthlabs.ai/docs/instruments/sound-intensity-decibel-level-calculator/implementation/

instrument implementation / implementation-contract

# Sound Intensity & Decibel Level Calculator implementation

A source-bound implementation contract for Sound Intensity & Decibel Level Calculator; deployment and executable qualification remain separate.

Status: **VERIFIED_CLEAN**Lifecycle: **implementation-contract**

## Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

**Record owner**: Guth Instruments

**Lifecycle**: verified-clean

**Evidence ID**: t5-105

**Effect**: Computation or source lookup only

## Input and validation requirements

The exact zero-distance input produces division by zero and must be rejected; additionally, an unspecified distance unit can shift the reported level by 40 dB for the same numeric input.

## Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

## Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

````
{
  "inputs": {
    "mode": "power_and_distance",
    "power_W": 1,
    "distance_m": 1
  },
  "expected_outputs": {
    "intensity_W_per_m2": 0.0795774715,
    "level_dB": 109.0079
  },
  "working": "4πr² = 4×3.14159265×1² = 12.5663706. I = P/(4πr²) = 1/12.5663706 = 0.0795774715 W/m². I/I0 = 0.0795774715/(1e-12) = 7.95774715e10. β = 10log10(7.95774715e10) = 10×10.900790 = 109.0079 dB."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/sound-intensity-decibel-level-calculator/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/sound-intensity-decibel-level-calculator/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/sound-intensity-decibel-level-calculator/qualification/>)

## Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

- `VERIFIED_LEDGER.json`

- `evidence-tranche5/tranche5-results.json`