A hot metal plate at is pressed against a cold plate at
PHYSICS · Single correct · CBSE · Physics · Thermal Properties of Matter · Thermal Properties of Matter
Problem
A hot metal plate at 120∘C is pressed against a cold plate at 30∘C.
Scenario I: The plates are separated only by a thin sheet of aluminum foil.
Scenario II: The plates are separated by a 5mm layer of fiberglass insulation.
Which of the following compares the net thermal energy transfer in Scenario II to Scenario I?
(a) The direction of energy transfer is unchanged, and the rate of transfer is the same in both scenarios because ΔT is identical.
(b) The direction of energy transfer is unchanged, but the rate of transfer is smaller in Scenario II.
(c) The direction of energy transfer is unchanged, and the rate of transfer is larger in Scenario II because the insulating layer is thicker.
(d) No energy transfer occurs in Scenario II because the fiberglass completely blocks conduction.