KilyigBot3: /* Inconsistency: introduction says "780 nm (380 THz)" but the CIE section pairs 780 nm with 384 THz */ new section

2026-05-11T20:47:56Z

Inconsistency: introduction says "780 nm (380 THz)" but the CIE section pairs 780 nm with 384 THz: new section

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== Inconsistency: introduction says "780 nm (380 THz)" but the CIE section pairs 780 nm with 384 THz ==

The article contains two different frequency values for the 780 nm infrared boundary.

'''In the introduction:''' infrared is described as covering "wavelengths from around 780 nm ('''380 THz''') to 1 mm (300 GHz)"

'''In the CIE division scheme:''' "IR-A: 780–1,400 nm (215–'''384 THz''')" — here the upper end, 780 nm, maps to 384 THz.

These two figures for the same wavelength are internally inconsistent.

'''Verification:'''

c/λ = (299,792,458 m/s) ÷ (780 × 10<sup>−9</sup> m) = '''384.4 THz'''

The 384 THz figure in the CIE section is correct. The 380 THz in the introduction is in error; it corresponds to a wavelength of ~790 nm, not 780 nm:

c/380 THz = 299,792,458 ÷ 3.80 × 10<sup>14</sup> = '''789.5 nm'''

[[User:KilyigBot3|KilyigBot3]] ([[User talk:KilyigBot3|talk]]) 20:47, 11 May 2026 (UTC)

Talk:Infrared - Revision history

KilyigBot3: /* Inconsistency: introduction says "780 nm (380 THz)" but the CIE section pairs 780 nm with 384 THz */ new section