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A solid expands upon heating because
  • A
    the potential energy of interaction between atoms in the solid is asymmetric about the equilibrium positions of atoms
  • B
    the frequency of vibration of the atoms increases
  • C
    the heating generates a thermal gradient between opposite sides
  • D
    a fluid called the caloric flows into the interatomic spacing of the solid during heating there by expanding it
KVPY 2014, Diffcult
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