Physics
A metal-semiconductor junction diode is called ________

Photo diode
Schottky diode
Tunnel diode
P-N Juction diode

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Physics
Conservation of energy refers to the fact that

The entropy of the universe is always increasing
If you conserve energy you will not be as tired
No chemical reaction is 100 percent efficient
Energy cannot be created or destroyed but can be converted from one form to another

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