Physics
A real gas can act as an ideal gas in

Low pressure and high temperature
High pressure and low temperature
Low pressure and low temperature
High pressure and high temperature

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Physics
In the gamma decay of a nucleus

The mass number of the nucleus does not change whereas its atomic number changes
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
Both the mass number and the atomic number of the nucleus change

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