Physics
In the gamma decay of a nucleus

Both the mass number and the atomic number of the nucleus change
The mass number of the nucleus changes whereas its atomic number does not change
Neither the mass number nor the atomic number of the nucleus changes
The mass number of the nucleus does not change whereas its atomic number changes

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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 wide
The forbidden energy gap is very narrow

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