Shown Here Is a Device That Can Be Used to Turn

question 49

Multiple Choice

Shown here is a device that can be used to turn a furnace on or off, depending on the temperature sensed by the device.
-In the figure,the principle underlying the operation of this device is that

• A)different metals have different latent heats.
• B)different metals have different thermal conductivities.
• C)different metals have different thermal expansion coefficients.
• D)heat always flows from hot to cold,never from cold to hot.
• E)different metals have different heat capacities.

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