Consider the following statements: A . Atoms of each element emit characteristics spectrum. B . According to…

Consider the following statements:
A. Atoms of each element emit characteristics spectrum.
B. According to Bohr's Postulate, an electron in a hydrogen atom revolves in a certain stationary orbit.

C. The density of nuclear matter depends on the size of the nucleus.
D. 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.

  1. A, B, C, D and E
  2. A, B and E only.
  3. B and D only
  4. A,C and E only

Solution

(A) True, an atom of each element emits a characteristic spectrum.

(B) True, according to Bohr's postulates mvr=nh2π and hence electron resides into orbits of specific radius called stationary orbits.

(C) False, the density of the nucleus is constant.

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

(E) True unstable nucleus show radioactivity.

Asked in: JEE Main 2021 (27 Jul Shift 2)

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