Name: 波長 - 為什麼紅色被用作危險信號？|#aumsum (Wavelength - Why red is used as a danger signal? | #aumsum)
Uploaded: 2021-01-14T08:11:00.000Z
Duration: 55 s
Description: 【看影片學英語】數萬部 YouTube 影片，搭配英漢字典即點即查，輕鬆掌握單字發音與用法，長久累積看電影不必再看字幕。

The major reason for red to be used as a danger signal is its wavelength.

Wavelength is the distance between two sea waves.

The distance between successive crests or troughs is called wavelength.

Longer the wavelength, lesser will be the scattering of light.

Now, among the colors of visible light, red has the longest wavelength.

Hence, it is least scattered by the atmospheric particles.

As a result, whether it is fog or smoke, red light passes comparatively easily through them.

Thus, it can be seen from maximum distance, making red color the right choice to convey any danger.

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波長 - 為什麼紅色被用作危險信號？|#aumsum (Wavelength - Why red is used as a danger signal? | #aumsum)

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