Two Types of Wall Separate a Refrigerated Room from the Rest

question 49

Multiple Choice

Two types of wall separate a refrigerated room from the rest of a building.Wall 1 has half the thermal conductivity of wall 2.Wall 2 is half as thick as wall 1.The two walls have the same area.The rate of heat flow through wall 2 compared with the rate of heat flow through wall 1 is

• A)four times greater.
• B)twice as great.
• C)the same.
• D)half as great.
• E)one-quarter as great.

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