NEET Physics Question - Thermal Physics

Assertion (A): All molecular motion ceases at \(-273.15^{\circ}C\).

Reason (R): Temperature \(0K\) cannot be attained.

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Solution:

Assertion (A) is true. \(-273.15^{circ}C\) is equivalent to \(0 K\), at which point theoretical classical molecular motion ceases. Reason (R) is true, as the Third Law of Thermodynamics states that absolute zero cannot be reached. However, R describes the attainability of \(0 K\), not the phenomenon of molecular motion ceasing at that temperature. Thus, R is not the correct explanation of A.

Rankers Physics

Molecular Motion and Absolute Zero

Solution:

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