An ice cube at temperature − 2 0 ∘ C is kept in a room at temperature 2 0 ∘ C . The variation of temperature of the body with time is given by

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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoCalorimetryMedium2 minQB

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An ice cube at temperature $- 2 0^{\circ} C$ is kept in a room at temperature $2 0^{\circ} C$ . The variation of temperature of the body with time is given by

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Solution:

The ice warms up toward $0^{\circ} C$ , with the rate decreasing as the temperature difference falls.
At $0^{\circ} C$ the temperature stays constant while the ice melts.
Then the water warms up and approaches $2 0^{\circ} C$ slowly (Newton's law of cooling).
Only graph (B) shows this shape.

Stream:JEESubject:PhysicsTopic:Heat & ThermoSubtopic:Calorimetry

⏱ 2mℹ️ Source: QB

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