Consider the following statements:

Physics Atomic and Nuclear Physics JEE Main 2021 MCQ (Single Correct)

Atoms of each element emit characteristics spectrum. A, B, C, D and E

According to Bohr's Postulate, an electron in a hydrogen atom, revolves in a certain stationary orbit. A, B and E only

The density of nuclear matter depends on the size of the nucleus. and only

A free neutron is stable but a free proton decay is possible. (E) Radioactivity is an indication of the instability of nuclei. Choose the correct answer from the options given below: A, C and E only

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The correct answer is:

True, atom of each element emits characteristic spectrum.

True, according to Bohr's postulates and hence electron resides into orbits of specific radius called stationary orbits.

False, density of nucleus is constant

False, A free neutron is unstable decays into proton and electron and antineutrino.

(E) True unstable nucleus show radioactivity.

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