Source: https://guthlabs.ai/docs/instruments/wavelength-frequency-sound-converter/implementation/

instrument implementation / implementation-contract

# Wavelength ↔ Frequency (Sound) Converter implementation

A source-bound implementation contract for Wavelength ↔ Frequency (Sound) Converter; 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**: t4-049

**Effect**: Computation or source lookup only

## Input and validation requirements

The inverse wavelength-to-frequency operation is undefined for zero wavelength, and the specification does not state an input-domain rejection rule. A temperature-unit ambiguity can also produce materially different results if a bare value such as 68 is interpreted as Fahrenheit rather than the specified Celsius.

## 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": {
    "frequency_hz": 440,
    "air_temperature_c": 20
  },
  "expected_outputs": {
    "speed_of_sound_m_per_s": 343.42,
    "wavelength_m": 0.7805
  },
  "working": "c = 331.3 + (0.606 × 20) = 331.3 + 12.12 = 343.42 m/s.\nλ = c/f = 343.42/440 = 0.7805 m."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/wavelength-frequency-sound-converter/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/wavelength-frequency-sound-converter/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/wavelength-frequency-sound-converter/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-tranche4/tranche4-results.json`