Which statement best describes convection patterns seen in infrared imaging?

• A. Uniform gradients
• B. Spikes and streaks
• C. Random speckles
• D. No discernible pattern

Answer: (C)

Convection patterns in infrared imaging show the temperature field being shuffled by moving air. When hot air rises and mixes with cooler air, especially in turbulent conditions, the surface temperature becomes uneven everywhere, with many small, changing pockets of warmth and coolness. An infrared camera picks up those tiny temperature differences, so the image looks mottled or speckled rather than smooth. That random, evolving texture reflects the chaotic mix of eddies in the flow. The other descriptions don’t fit: a uniform gradient would mean a steady, simple heating with laminar flow; spikes and streaks would point to sharp, directional features or artifacts rather than the chaotic convection texture; no discernible pattern would ignore the visible temperature fluctuations caused by convection.