Source: https://guthlabs.ai/docs/instruments/photon-energy-momentum-calculator/implementation/

instrument implementation / implementation-contract

# Photon Energy & Momentum Calculator implementation

A source-bound implementation contract for Photon Energy & Momentum 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**: t5-226

**Effect**: Computation or source lookup only

## Input and validation requirements

The specification exposes undefined behavior at zero frequency, an endpoint-label ambiguity at spectral boundaries, and a sign-convention hazard for negative wavelength input. A robust implementation must reject invalid zero or negative physical inputs and define inclusive spectral-band boundaries.

## 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": {
    "f_Hz": 500000000000000
  },
  "expected_outputs": {
    "E_J": 3.313035075e-19,
    "lambda_m": 5.99584916e-7,
    "p_kg_m_per_s": 1.1051095285e-27,
    "spectral_region": "visible"
  },
  "working": "E=hf=(6.62607015×10^-34)(5.00×10^14)=3.313035075×10^-19 J. λ=c/f=299792458/(5.00×10^14)=5.99584916×10^-7 m=599.584916 nm, which is visible under a typical 380–750 nm convention. p=E/c=(3.313035075×10^-19)/299792458=1.1051095285×10^-27 kg·m/s."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/photon-energy-momentum-calculator/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/photon-energy-momentum-calculator/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/photon-energy-momentum-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`