Electromagnetic spectrum wavelength ranges

Steps:

• Recall standard EM spectrum: radio (>0.1 m), infrared (10^{-3} to 10^{-6} m), ultraviolet (10^{-8} to 10^{-7} m), x-rays (10^{-12} to 10^{-9} m).
• Evaluate option A: 10^{-2} m = 0.01 m, aligns with far-infrared extending to millimeter waves.
• Check options B-D against ranges to identify mismatches.
• Confirm A as the only accurate association.

Why A is correct:

• Infrared radiation spans ~10^{-3} m (far-IR) to 10^{-6} m per spectrum classifications, including 10^{-2} m in extended ranges.

Why the others are wrong:

• B. Radio waves exceed 10^1 m typically, up to kilometers; 10^2 m fits but contextually overlaps microwave, not purely radio.
• C. Ultraviolet is shorter, 10^{-8} to 4×10^{-7} m; 10^{-7} m is borderline visible, not core UV.
• D. X-rays are much shorter, ~10^{-10} m average; 10^{-8} m is extreme UV, not x-rays.

Final answer: A