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A solid material is supplied with heat at a constant rate. The temperature of the material is changing with the heat input as shown in figure. Study the graph carefully and answer the following questions : (i) What do the horizontal regions AB and CD represent? (ii) if CD = 2AB, what do you infer ? (iii) The slope of OA gt the slope of BC. What does this indicate ? (iv) What does the slope DE represent ?

Answer» <html><body><p></p><a href="https://interviewquestions.tuteehub.com/tag/solution-25781" style="font-weight:bold;" target="_blank" title="Click to know more about SOLUTION">SOLUTION</a> :(i) In the regions AB and CD the <a href="https://interviewquestions.tuteehub.com/tag/temperature-11887" style="font-weight:bold;" target="_blank" title="Click to know more about TEMPERATURE">TEMPERATURE</a> of the material remains constant. So AB represents fusion and CD represents vapourisation. <br/>(ii) CD= 2AB or `Q_(4) = 2Q_(2)`, it shows that latent <a href="https://interviewquestions.tuteehub.com/tag/heat-21102" style="font-weight:bold;" target="_blank" title="Click to know more about HEAT">HEAT</a> of vapourisation is twice that of latent of fusion. <br/>(iii) Let `S_(1) and S_(2)` be the specific heats of <a href="https://interviewquestions.tuteehub.com/tag/solid-1216587" style="font-weight:bold;" target="_blank" title="Click to know more about SOLID">SOLID</a> and liquid states respectively, then <br/> `Q_(1) = mS_(1) Delta T_(1) " or " S_(1) = (1)/(m((Delta T_(1))/(Q_(1)) ) ) = (1)/( m xx "slope of OA")` <br/> Similarly `S_(2) = (1)/(m xx "slope of BC")` <br/> Since slope of OA `gt` slope of BC, `therefore S_(1) lt S_(2)`. <br/> (iv) If `S_(3)` is the specifice heat of vapour state (region DE),<br/> then `S_(2) = (1)/(m xx "slope of BC")` <br/> or Slope of DE= `(1)/(mS_(3)) = (1)/("heat capacity")`</body></html>


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