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Q.

The mobility of free electrons is greater than that of free holes because

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a

they are light

b

they mutually colllide less

c

they require low energy to continue their motion

d

they carry negative charge

answer is A.

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Detailed Solution

The electron mobility is often greater than hole mobility because quite often, the electron effective mass is smaller than hole effective mass. The relaxation times are often of the same order of magnitude for electrons and holes and therefore, they do not make too much difference.

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