Physics
In the gamma decay of a nucleus

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

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Physics
Kinetic energy depends on

The mass of the moving body
The velocity or speed of the moving body.
Both mass and velocity of the moving body
The pressure of the moving body

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