There are 8 photons will be involved in the transfer of 4 electrons from psii to 2 nadp.
The photon of light energy moves till it encounters a chlorophyll molecule. An electron inside the chlorophyll is "activated" by the photon. The electron is provided energy, which enables it to separate from a chlorophyll molecule atom. Therefore, it must be claimed that chlorophyll "donates" an electron.
NADP+, the last electron receiver for linear photosynthesis, needs two electrons to become NADPH. There are 2 NADPH created for every 8 photons (4 to PS-I & PS-II each).
Therefore, there are 8 photons will be involved in the transfer of 4 electrons from psii to 2 nadp.
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