Heat energy added Figure 4 Heating Curve 125 °C 100 °C 75 °C 50 °C 25 °C 0 °C -25 °C Temperature condensation Heat energy removed Figure 5 Cooling Curve
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A heating curve has been plotted for a solid object as shown in the figure. If the mass of the object is $200 \mathrm{~g}$, then latent heat of vaporisation for the material of the objects, is [Power supplied to the object is constant and equal to $1 \mathrm{~kW}]$ (a) $4.5 \times 10^{6} \mathrm{~J}-\mathrm{kg}^{-1}$ (b) $4.5 \times 10^{6} \mathrm{cal}-\mathrm{g}^{-1}$ (c) $4.5 \times 10^{8} \mathrm{~J}-\mathrm{kg}^{-1}$ (d) $4.5 \times 10^{4} \mathrm{cal}-\mathrm{g}^{-1}$
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