784 nm is the wavelength corresponding to light of the lowest frequency in this group. Hence, option B is correct.
Wavelength is the distance between identical points (adjacent crests) in the adjacent cycles of a wave form signal propagated in space or along a wire.
Radio waves usually have the lowest frequency, while Gamma rays have the highest frequency.
Violet - shortest wavelength, around 400-420 nanometers with highest frequency.
Indigo - 420 - 440 nm.
Blue - 440 - 490 nm.
Green - 490 - 570 nm.
Yellow - 570 - 585 nm.
Orange - 585 - 620 nm.
Red - longest wavelength, at around 620 - 780 nanometers with the lowest frequency.
Hence, option B is correct.
Learn more about the wavelength here:
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