Consider the following statements :


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

Correct Option: , 2


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

(B) True, according to Bohr's postulates

$\mathrm{mvr}=\frac{\mathrm{nh}}{2 \pi}$ and hence electron resides into

orbits of specific radius called stationary orbits.

(C) False, density of nucleus is constant

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

(E) True unstable nucleus show radioactivity. 

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