Which radiation has wavelengths longer than thermal infrared?

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Multiple Choice

Which radiation has wavelengths longer than thermal infrared?

Explanation:
Understanding where a wavelength sits on the electromagnetic spectrum helps compare regions by length. Thermal infrared covers mid-infrared wavelengths emitted by objects at typical temperatures, roughly from a few micrometers up to a few tens of micrometers. Microwaves have wavelengths in the millimeter to centimeter range, which are longer than infrared wavelengths, so they are the ones longer than thermal infrared. The other options correspond to shorter wavelengths: visible light is about 0.4–0.7 micrometers, ultraviolet is even shorter, and X‑rays are far shorter still. So microwaves are the correct choice.

Understanding where a wavelength sits on the electromagnetic spectrum helps compare regions by length. Thermal infrared covers mid-infrared wavelengths emitted by objects at typical temperatures, roughly from a few micrometers up to a few tens of micrometers. Microwaves have wavelengths in the millimeter to centimeter range, which are longer than infrared wavelengths, so they are the ones longer than thermal infrared. The other options correspond to shorter wavelengths: visible light is about 0.4–0.7 micrometers, ultraviolet is even shorter, and X‑rays are far shorter still. So microwaves are the correct choice.

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