A hotter object emits longer wavelengths than a cooler object.

Name: A hotter object emits longer wavelengths than a cooler object.
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A hotter object emits shorter wavelengths than a cooler object. This is known as Wien's law, which states that the wavelength of maximum radiation emitted by an object is inversely proportional to its temperature. As the temperature of an object increases, the peak wavelength of its emitted radiation shifts to shorter (i.e. hotter) wavelengths.

A Hotter Object Emits Longer Wavelengths Than a Cooler Object