Why is the base of a transistor made thin and is lightly doped?

Why in case of a transistor , the emitter is heavily doped ?

Among emitter base and collector regions of a a transistor which one is the most heavily doped.

Why cores of transformer are made of thin metal strip?

Why is the wall of a dam made stronger and thicker at the base than at the top ?

The r.m.s. value of the base current of a transistor is 10 muA . What is the current gain (beta) if the peak value of the a.c. collector current is 1.414 mA?

The emitter of a transistor is doped the heaviest because it

The part of a transistor, which is heavily doped to produce a large number of majority carriers is called:

Least doped region in a transistor

What kinds of biasing are required to the collector and base of a transistor in a common emitter amplifier?