What is the diff b/n rest mass and effective mass. What does 'holes have effective mass".?

Question

Pertaining to semiconductors.

In semiconductors, what does 'holes have effective mass, but no rest mass" mean?

Answer 1

The movement of a hole in p-type semiconductor is in fact the movement of electrons sequentially filling a valence band vacancy.
This means that holes tend to move at a lower speed than electrons would in the same material with the same electric field applied.
We measure the effective mass of the hole by applying a field to the material and seeing how fast the holes accelerate (Newton's Law)

If you look at the characteristics of complementary transistors, which are being sold as matched pairs, you will see the extra mass of the hole manifests as an inferior characteristic in the p-type carrier transistor or FET.

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Answer 2

Answer forthcoming once you restate the question in English.