A **spectral signature** refers to the unique pattern of reflectance or emittance of electromagnetic radiation (light) from an object or material across different wavelengths of the electromagnetic spectrum. Each material has a distinct spectral signature that can be used to identify and differentiate it from other materials. ### Key Points about Spectral Signatures: 1. **Electromagnetic Spectrum**: Spectral signatures are typically measured across various wavelengths, which may include ultraviolet, visible light, infrared, and microwave ranges.
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