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Assertion (A): The growth equation contains a term for heat conduction as well as one for vapour diffusion.
Reason (R): Both the removal of latent heat and the supply of vapour limit how fast a droplet can grow.

  • A.Both A and R are true, but R is not the correct explanation of A
  • B.A is true but R is false
  • C.A is false but R is true
  • D.Both A and R are true, and R is the correct explanation of A

Answer: D

Both are true and the reason gives the two limitations, and either can dominate depending on temperature and pressure. At low temperatures the vapour term dominates, while heat conduction matters more in warm conditions.

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