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NEET
Exam
NEET
Subject
Physics
Chapter
Nuclear Physics

NEET · Physics · Nuclear Physics

Consider the following statements: A . Atoms of each element emit...

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

C.C . The density of nuclear matter depends on the size of the nucleus.
D.D . A free neutron is stable but a free proton decay is possible.
E.E . Radioactivity is an indication of the instability of nuclei. Choose the correct answer from the options given below.

Options

  1. AA,B,C,DA, B, C, D and EE
  2. BA,BA, Band EE only.
  3. CBB and DD only
  4. DA,CA, C and EE only

Correct answer

B. A,BA, Band EE only.

Step-by-step solution

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

(B)( B ) True, according to Bohr's postulates mvr=nh2πmvr = \dfrac{nh}{2\pi} and hence electron resides into orbits of specific radius called stationary orbits.

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

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

(E)( E ) True unstable nucleus show radioactivity.

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