The Diffusion Current In A p-n junction Is 

In a half wave rectifier, the r-ms value of ac component of the wave is

The correct rllation between the two current gains α and β in a transistor is

For germanium crystal, the forbidden energy gap in joules is

The value of from factor of full wave rectifier is

When the p-end of the p-n junction is connected to the negative terminal of the battery and the n-end to the positive terminal of the battery, then thep-n junction behaves like :   

n-type semiconductor is formed :

An n-type and a p-type silicon can be obtained by doping pure silicon with : 

An n-type semiconductor is :

The drift current in a p-n junction is :

In a p-n-p transistor with normal bias: