Which wavelength is the longest?

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Multiple Choice

Which wavelength is the longest?

Explanation:
In visible light, wavelength increases from violet toward red. Red light has the longest wavelengths, roughly 620–750 nanometers, which are longer than those of orange, yellow, and green. Since longer wavelength means lower frequency and lower photon energy, red sits at the far end of the spectrum compared to the other colors listed. So red is the longest wavelength among these options.

In visible light, wavelength increases from violet toward red. Red light has the longest wavelengths, roughly 620–750 nanometers, which are longer than those of orange, yellow, and green. Since longer wavelength means lower frequency and lower photon energy, red sits at the far end of the spectrum compared to the other colors listed. So red is the longest wavelength among these options.

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