Question

ASSERTION; According to Rutherford
the revolution of the electron in a
circular orbit is not expected to be
stable.
REASON; Because any particle in
circular orbit would undergo
acceleration

a
B
c
d​

Answer 1

$\mathtt{\huge{\underline{\red{Answer :-}}}}$

➝ Both assertion & reason are correct .

The revolution of the electron in a circular orbit is not expected to be stable when the particle in a circular orbit undergoes acceleration.

The electron revolving around the nucles will loose the energy & gets attracted by the nucleus & fall into nucleus.

Information regarding question :-

• According to classical electromagnetic theory, when a charged particle moves under the influence of attractive force, it loses energy continuously in the form of electromagnetic radiations. Thus, when the electron (a charged particle) moves in an attractive field (created by protons present in the nucleus). it must emit radiations. As a result of this, the electron should lose energy at every turn and move closer and closer to the nucleus following a spiral path.

• The ultimate result will be that it will fall into the nucleus, thereby making the atom unstable. Bohr made calculation and pointed out that an atom would collapse in 10^-8 seconds. Since, the atom is quite stable, it means the electrons do not fall into the nucleus, thereby this model does not explain the stability of the atom.

• If the electrons lose energy continuously, the observed spectrum should be continuous but the actual observed spectrum consists of well defined lines of definite frequencies. Hence, the loss of energy by the electrons is not continuous in an atom.

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