Assertion :A common model of a solid assumes the atoms to be points executing SHM about mean lattice positions. This model cannot explain thermal expansion of solids. Reason: The average distance over a time period of oscillation between the particles remains constant.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Assertion:-
A common model of a solid assumes the atoms to be points executing SHM about mean lattice positions. This model can not explain thermal expression of solids.
Reason:-
The average distance over a time period of oscillation between the particles remains constant.
Both Assertion and Reason are correct and Reason is the correct explanation for assertion.

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