Electromagnetic spectrum classification by wavelength

Steps:

• Convert 100 pm to 0.1 nm and 100 μm to 100,000 nm for comparison.
• Locate 0.1 nm in the X-ray range (0.01–10 nm).
• Locate 100,000 nm (100 μm) in the infrared range (700 nm–1 mm).
• Select option matching X-rays for 100 pm and infrared for 100 μm.

Why C is correct:

• X-rays span 0.01–10 nm (includes 0.1 nm from 100 pm), and infrared spans 700 nm–1 mm (includes 100 μm), per standard EM spectrum divisions.

Why the others are wrong:

• A and B: 100 pm (0.1 nm) exceeds gamma-ray limit (<0.01 nm).
• D: 100 μm (100,000 nm) far exceeds red light's visible range (620–750 nm).

Final answer: C