The graph above illustrates the variation of temperature \(\theta\) with time (t) for a solid that is being heated. Which processes take place at segments P and Q respectively?
A.
Freezing and vaporization
B.
Evaporation and solidification
C.
Melting and boiling
D.
Condensation and evaporation
Correct answer is C
Since the substance is solid, it will need heat to melt to liquid and once the liquid starts boiling temperature will remain the same.