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Q.

Consider the following statements
(A) A common model of a solid assumes the atoms executing SHM about mean lattice positions. This model cannot explain thermal expansion of solids.
(B) The average distance over a time period of oscillation between the particles remains constant.


 

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a

Both (A) and (B) are true.
 

b

(A) is true But (B) is false.
 

c

(A) is false But (B) is true.
 

d

Both (A) and (B) are false.

answer is A.

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Detailed Solution

Intermolecular distance between atoms remain the same hence, no thermal expansion

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Consider the following statements(A) A common model of a solid assumes the atoms executing SHM about mean lattice positions. This model cannot explain thermal expansion of solids.(B) The average distance over a time period of oscillation between the particles remains constant.