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Wave Optics
Question
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In an unbiased p-n junction, holes diffuse from the p-region to n-region because
(a)    free electrons in the n-region attract them.
(b)    they move across the junction by the potential difference.
(c)    hole concentration in p-region is more as compared to n-region.
(d)    all the above.

Answer

(c) is the correct statement. 

In an unbiased p-n junction, hole concentration in p-region is more than in n-region and due to difference in concentration of charge carriers, holes diffuse from p-region to n-region.

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