The Question is from neet-physics thermodynamics , and it was created by the author SUBHANI

Question

If two objects are at different temperatures, which of the following is guaranteed to happen when they are brought into thermal contact?

SUBHANI · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
 **Primary Concept**: Heat Transfer
 **Related Topics**: Thermodynamics, Thermal Equilibrium
 **Prerequisites**: Understanding of temperature and heat flow.
## SOLUTION PATHWAY
**Given Information**:
  Two objects at different temperatures are brought into thermal contact.
  
**Method & Steps**:
 1. Define Heat Transfer:
  Reasoning: Heat transfer is the spontaneous flow of thermal energy from a region of higher temperature to a region of lower temperature. This flow continues until thermal equilibrium is reached.
  Formula/Rule:  None explicitly needed, but the concept is based on the second law of thermodynamics.
 2. Analyze the options:
  Working: Option C directly states that heat will flow from the hotter object to the colder object, which is the definition of heat transfer.  Options A and B are incorrect; mass transfer isn't directly related to temperature differences. Option D is incorrect because it takes time for the temperatures to equalize; the rate depends on factors like thermal conductivity, surface area, and mass.
 3. Conclusion:
  Result: The only guaranteed outcome is that heat flows from the hotter object to the colder object.
  Verification: This aligns with the fundamental principle of heat transfer and the second law of thermodynamics.
 ## OPTION ANALYSIS
A :x: The mass of an object does not change simply due to a temperature change unless there is a phase change or a chemical reaction.
B :x: Similar to option A, mass change is not directly related to heat transfer between objects at different temperatures.
C ✓: This is the correct answer because heat always flows spontaneously from a hotter object to a colder object until thermal equilibrium is reached.
D :x: While thermal equilibrium is eventually reached, it doesn't happen instantly. The rate of temperature equalization depends on various factors.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing heat transfer with mass transfer:  Remember that heat is energy transfer, not matter transfer.
  2.Assuming instantaneous thermal equilibrium:  Temperature equalization takes time.
 **Quick Tips**:
  1.Visualize the heat flow as a movement from high temperature to low temperature like water flowing downhill.
  2.Remember the second law of thermodynamics: Heat flows spontaneously from hot to cold.

SUBHANI · Answer

The colder object will increase in mass.

SUBHANI · Answer

The hotter object will decrease in mass.

SUBHANI · Answer

The correct Option is "Heat will flow from the hotter object to the colder object."

SUBHANI · Answer

Their temperatures will equalize instantly.

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