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"mean reverse transit time" vs "mean forward

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NaumanAhmed

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In the case of NPN Bjt the "mean forward transit time
TF" is given as
(base width)²/2 x (DIFFUSION CONSTANT OF THE ELECTRONS IN THE BASE)
"mean REVERSE transit time TR " is also given as
(base width)²/2 x (DIFFUSION CONSTANT OF THE ELECTRONS IN THE BASE)
then why TR>TF ?? Is the diffisusion coeffcient in the
case of reverse mode is smaller than that of the
forward mode???
 

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