Question

Which of the following systems may be adequately described by classical physics?
(a) motion of a cricket ball
(b) motion of a dust particle
(c) a hydrogen atom
(d) a neutron changing to a proton
Concept of Physics - 1 , HC VERMA , Chapter "The Force

Answer 1

Hello Dear.

Option (a) & (b) is correct. 

Reason/Explanation:-

For option (a) & (b) :-

The size of the cricket ball & dust particle is greater then 10⁻⁶ m.
So this can be explained by classical mechanics as Motion of a cricket ball is in projectile motion , So it can be described.


For option (c) & (d) :-

We know the size of the neutron , proton and the hydrogen atom are very much smaller, which cannot even seen by naked eye. which is even less then 10⁻⁶ m.
Thus motion of these particles may not be adequately described by classical mechanics. Thus option (c) and (d) are incorrect.


Hope it Helps.

Answer 2

Motion of a cricket ball and motion of a dust particle systems may be adequately described by classical physics.

Explanation:

Option (a) and (b) are correct

• Classical physics accurately explains ball movement and dust particle movement. It also defines the law of motion of Newton, the law of gravitation of Newton, the thermodynamics laws, the electromagnetism of Maxwell and the force of Lorentz.
• Classical physics explains the structure of celestial bodies, such as the Sun, the Earth, and the Moon. It is, however, insufficient to characterize particle systems with sizes much smaller than $10^{-6}$ m (e.g., nuclei, atom and another elementary particles ).

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