Physics
In the gamma decay of a nucleus

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
Both the mass number and the atomic number of the nucleus change

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Physics
What is the direction of torque?

Parallel to the radius
Perpendicular to the direction of applied force
Same as the direction of applied force
Opposite to the direction of applied force

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