The first transistor, made of gold, plastic, and germanium (a metallic
crystal), was about the size of what? *
O
Silicon Wafer
A Watch Face
O
Adult's Fingernail
Child's Toenail

The first transistor made of gold, plastic and germanium was about the size of adult's fingernail.

Option C

Explanation:

The first transistor made of gold, plastic and germanium was invented in Bell laboratories. It is termed as point contact transistor. As it is made like a pointed arrow with both the sides covered with layer of gold foil. The germanium is used at the tip, just like the base and the gold foil ends as collector and emitter.

The size of this transistor is about the size of adult's fingernail. It is very small in size and it was one of its kind. Due to this small size and the working capacity by the point contact, it is termed as point contact transistor.