Yield changes the finite carrier-pair count. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
Quarter yield makes two pairs
Accepted photons stay at 8. Yield one quarter gives pair count 2.
pairs=8⋅41=2
Half yield makes four pairs
Accepted photons stay at 8. Yield one half gives pair count 4.
pairs=8⋅21=4
Full yield makes eight pairs
Accepted photons stay at 8. Yield one gives pair count 8.