Wavelength is the physical distance between successive peaks in a wavetrain. We can distinguish between different forms of radiant energy by arranging radiation by wavelength along an electromagnetic spectrum . When our eyes perceive color, they are seeing the wavelengths of visible light that are reflected from an object. Contrast red vs. blue shirt. White colors reflect all light, black absorbs all light.
White objects reflect energy, dark objects absorb energy.
Summer vs. winter clothing. E. The hotter the object, the shorter the dominant wavelength of radiation. This peak occurs well into the infra-red portion of spectrum. Earth emits terrestrial, or long-wave radiation , generally above 4 micrometers. This peak occurs in yellow light.