Question: For each of these changes in a metal, predict whether the average time interval between collisions of an electron with a lattice ion increases or

For each of these changes in a metal, predict whether the average time interval between collisions of an electron with a lattice ion increases or decreases:

(a) spatial density of the lattice ions is increased,

$(b)$ size of the lattice ions is decreased,

(c) charge of the lattice ions is increased.

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