Three different materials of identical masses are placed in turn in a special oven where a material absorbs energy at a certain constant rate. During heating process, each material begins in the liqui

Question

Three different materials of identical masses are placed in turn in a special oven where a material absorbs energy at a certain constant rate. During heating process, each material begins in the liquid state and ends in gaseous state. Following figure gives the temperature $T$ versus time $t$ for three materials. $C$ represents specific heats in liquid state and $L$ represent latent heat of vaporisation. Then

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Heat is supplied at a constant rate P : P = m C d t d T ​ ⇒ C = m ( d T / d t ) P ​ The liquid line of 2 is the steepest, then 1, then 3. So C is smallest for 2 and largest for 3. C 3 ​ > C 1 ​ > C 2 ​ The boiling plateau gives latent heat: L = Pt / m Plateau 1 is longest, then 3, then 2. L 1 ​ > L 3 ​ > L 2 ​

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