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Heat will flow from object A to object B if: I. The molecular average kinetic energy of the two...

Question:

Heat will flow from object A to object B if:

I. The molecular average kinetic energy of the two objects is the same.

II. The molecular average kinetic energy of A is higher than that of B.

III. The molecular average kinetic energy of B is higher than that of A.

a. I only

b. II only

c. I and III

d. III only

Heat transfer


Heat transfer means the flow of heat from a body at higher temperature to a body at lower temperature. Heat transfer can mainly occur by three processes- conduction, convection and radiation.


Answer and Explanation:


Heat will flow from object A to object B if (b) II only, i.e., when the molecular average kinetic energy of A is higher than that of B. When the body has higher kinetic energy, it means the temperature of A will be higher. Hence, it will transfer some of its heat to B. When they have same kinetic energy, no such net movement of heat will occur. If B had higher kinetic energy heat flow would have been in the opposite direction.



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Thermal Expansion & Heat Transfer

from High School Physics: Help and Review

Chapter 17 / Lesson 12
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