Question:
Ice at temperature –10°C is converted to steam at 100°C, the curve plotted between temperature (T) and time (t) when it is being heated by constant power source is
Ice at temperature –10°C is converted to steam at 100°C, the curve plotted between temperature (T) and time (t) when it is being heated by constant power source is
Updated On: Nov 16, 2024
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The Correct Option is B
Solution and Explanation
Solution: The heating process involves several stages:
Heating Ice from -10°C to 0°C: The temperature increases until it reaches 0°C.
Melting Ice at 0°C: The temperature remains constant while the ice melts into water, represented as a plateau on the graph.
Heating Water from 0°C to 100°C: The temperature of the water increases until it reaches 100°C.
Boiling Water at 100°C: The temperature remains constant as the water turns into steam, represented as another plateau on the graph.
Heating Steam from 100°C Onward: The temperature of the steam increases.
The correct graph will show:
- An initial increase in temperature from -10°C to 0°C.
- A plateau at 0°C during the melting phase.
- An increase in temperature from 0°C to 100°C.
- A plateau at 100°C during the boiling phase.
- A continued increase in temperature as steam is heated.
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Concepts Used:
Heat Transfer
What is Heat Transfer?
It is defined as the movement of heat across the border of the system due to a difference in temperature between system and its surroundings.
How is Heat Transferred?
Heat can travel from one place to another in several ways. The different modes of heat transfer include:
- Conduction - Heat flows from things with higher temp to objects with lower temp.
- Convection - Movement of liquid molecules from higher temp regions to lower temp regions.
- Radiation - Radiant heat is present in every other way in our daily lives. Thermal radiations are also known to as radiant heat. Thermal radiation is generated by the emission of electromagnetic waves.
