Physics
In a conductor

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

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Physics
Why are we able to hear short wave broadcasts better than long wave broadcasts ?

Short waves are more energetic than long waves.
Short waves are unaffected by atmospheric disturbances.
By convention, short waves are meant for long distances, whereas long waves are reserved for short distances.
Short wave broadcasts are made by nearby radio stations.

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