Physics
Which of the following occurred first ?

Guglielmo Marconi sent out the first wireless signals
Wright Brothers successfully flew an aircraft
Max Planck unveiled the Quantum Theory
Albert Einstein propounded the General Theory of Relativity

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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
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

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