Physics
Isotopes of an element contain

equal number of nucleons
the same number of protons but different number of neutrons
equal number of protons and electrons
the same number of neutrons but different number of protons

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Physics
Which of the following occurred first ?

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

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