Without the reference table, list the seven principal electromagnetic bands in decreasing wavelength order and give approximate wavelength ranges in metres for each. State the required visible-light interval in nanometres. Identify the bands for 2 m, 2 cm, 20 μm, 500 nm, 50 nm, 0.5 nm and 0.5 pm.

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Radio, microwave, infrared, visible, ultraviolet, X-ray, gamma. Approximate ranges: >10⁻¹; 10⁻³–10⁻¹; 7×10⁻⁷–10⁻³; 4×10⁻⁷–7×10⁻⁷; 10⁻⁸–4×10⁻⁷; 10⁻¹¹–10⁻⁸; <10⁻¹¹ m. Visible 400–700 nm. The seven supplied wavelengths fall in those seven bands respectively. Give the long-to-short order. Give reasonable conventional ranges for all seven bands; do not penalize a defensible nearby convention for approximate non-visible boundaries. Recall visible 400–700 nm explicitly. Convert centimetres, micrometres, nanometres and picometres to metres and classify. Acknowledge approximate/overlapping band boundaries.

Rebuild the wavelength ladder from memory

Without the reference table, list the seven principal electromagnetic bands in decreasing wavelength order and give approximate wavelength ranges in metres for each. State the required visible-light interval in nanometres. Identify the bands for 2 m, 2 cm, 20 μm, 500 nm, 50 nm, 0.5 nm and 0.5 pm.

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