In the depletion region of an unbiased P-N junction diode there are
Only electrons
Only holes
Both electrons and holes
Only fixed ions
As we discussed in concept
P-N junction -
When p type semiconductor is mixed with N - type semiconductor, P-N junction formed
- wherein
There is very thin region (of the order of micro meter) called depution region.
In the depletion region, all the holes and electrons combined together and anhiliate each other and hence only ions will be present in depletion region.
Option 1)
Only electrons
This option is incorrect.
Option 2)
Only holes
This option is incorrect.
Option 3)
Both electrons and holes
This option is incorrect.
Option 4)
Only fixed ions
This option is correct.