Multiple Choice
Why did the transfer of energy between the two samples stop?
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20. Heat and Temperature
Heat Transfer
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In which of the following situations would a person lose heat by conduction?
A
Sitting on a cold metal bench
B
Feeling the warmth of the sun on a sunny day
C
Wearing a thick wool sweater
D
Standing in front of a fireplace
Verified step by step guidance1
Understand the concept of conduction: Conduction is the process of heat transfer through direct contact between materials. It occurs when there is a temperature difference between two objects in contact, causing heat to flow from the warmer object to the cooler one.
Identify the scenarios: We have four scenarios to consider: sitting on a cold metal bench, feeling the warmth of the sun, wearing a thick wool sweater, and standing in front of a fireplace.
Analyze each scenario for conduction: Conduction requires direct contact with a cooler object. In the scenario of sitting on a cold metal bench, the person is in direct contact with a cooler surface, which can lead to heat loss from the person to the bench.
Evaluate the other scenarios: Feeling the warmth of the sun involves radiation, not conduction. Wearing a thick wool sweater involves insulation, which reduces heat loss. Standing in front of a fireplace involves radiation and convection, not direct contact with a cooler object.
Conclude which scenario involves conduction: Based on the analysis, sitting on a cold metal bench is the situation where a person would lose heat by conduction, as it involves direct contact with a cooler surface.
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