A solid material is supplied with heat at a c | vedclass

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Question

(C) In a heating curve,the horizontal sections represent phase changes where temperature remains constant. Thus,$AB$ and $CD$ represent phase changes.

Vedclass · Accepted Answer

Latent heat of fusion is twice the latent heat of vaporization.

Vedclass · Answer

(C) In a heating curve,the horizontal sections represent phase changes where temperature remains constant. Thus,$AB$ and $CD$ represent phase changes.$AB$ corresponds to the melting process (solid to liquid),and $CD$ corresponds to the boiling process (liquid to vapour).The heat supplied during a phase change is given by $Q = mL$,where $m$ is the mass and $L$ is the latent heat.Since the heat is supplied at a constant rate,the length of the horizontal segment is proportional to the heat supplied $(Q)$.From the graph,the length of $CD$ is twice the length of $AB$ $(CD = 2AB)$,which implies that the latent heat of vaporization $(L_v)$ is twice the latent heat of fusion $(L_f)$.Therefore,the statement that 'latent heat of fusion is twice the latent heat of vaporization' is false.

$A$ solid material is supplied with heat at a constant rate and the temperature of the material changes as shown in the graph. From the graph,the false conclusion drawn is:

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