Physics
The sensation of weightlessness in a spacecraft in an orbit is due to the

Fact that spacecraft in the orbit has no energy
Presence of gravity outside but not inside the spacecraft
Absence of gravity outside
Acceleration in the orbit which is equal to the acceleration due to gravity outside

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Physics
In a conductor

The valence band and the conduction band overlap each other
The forbidden energy gap is very wide
There is no conduction band
The forbidden energy gap is very narrow

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