CBSE Class 9 Answered
Which of the following graphs cannot be a time temperature graph?
Asked by poonambhati19844 | 28 Dec, 2021, 03:11: PM
Expert Answer
Graph-B cannot be a time temperature graph . Explanation is given below
In graph-A , temperature linearly increaing upto second division , then from second division
to third division temperature remains constant and later on again increasing linearly .
The characterstic shown in graph-A can be temperature variation in melting of ice or boiling of liquid.
Ice may be melting by absorbing heat . When it reaches 0o C temperature remains constant
while absorbing latent heat and then temperature increases in liquid water due to absorption of heat.
Similarly temperature of liquid increasing due to absorption of heat When the temperature reaches boiling point
temperature remains constant due to latent heat and then vapour temperature increases if heat is supplied further.
Hence during phase-change, temperature remains constant for some finite time.
But in garph-B , transition of temperature at second division of time is instantatneous. At second division of time
we can not determine time from the given graph because in no time appreciable increase of temperature occurs.
Physically this is not true .
Transition in temperature occurs at phase change and temperature will remain constant during phase-change.
Due to this above mentioned reasoins , graph-B can not be a time-temeprature graph.
Answered by Thiyagarajan K | 28 Dec, 2021, 04:33: PM
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