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Light Reaction – Photosystems
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The reaction centre in PS II has an absorption maxima atA 780 nmB 680 nmC 700 nmD 660 nm
The PS II reaction centre absorbs maximally at 680 nm ($P_{680}$).
In PS I the reaction centre chlorophyll a has an absorption peak at 700 nm, hence is called $P_{700}$, while in PS II it has absorption maxima at 680 nm, and is called $P_{680}$.