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12. atoms — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics12. atoms1 Mark
MCQ
Choose the correct option from the following options given below
  • A
    In the ground state of Rutherford's model electrons are in stable equilibrium. While in Thomson's model electrons always experience a net-force.
  • B
    An atom has a nearly continuous mass distribution in a Rutherford's model but has a highly non-uniform mass distribution in Thomson's model
  • ✓
    A classical atom based on Rutherford's model is doomed to collapse.
  • D
    The positively charged part of the atom possesses most of the mass in Rutherford's model but not in Thomson's model.
✓

Answer

Correct option: C.
A classical atom based on Rutherford's model is doomed to collapse.
c
According to Rutherford, $e ^{-}$revolves around nucleus in circular orbit. Thus $e ^{-}$is always accelerating (centripetal acceleration). An accelerating change emits $EM$ radiation and thus $e ^{-}$ should loose energy and finally should collapse in the nucleus.

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