Rachel performed an investigation to study the thermal conductivity of four different materials. She started with four identically shaped rods—each made of a different material. Then, she placed one end of each rod into a pot of boiling water, which was at 100°C.After five minutes, Rachel measured the temperatures of the ends of the rods that were sticking up out of the pot to see whether they got hot. Her results are shown below.Thermal Conductivity InvestigationMaterial Temperature of End of RodAfter 5 MinutesMaterial 1 41°CMaterial 2 53°CMaterial 3 98°CMaterial 4 59°CRachel knows that one of the materials is copper and that copper conducts thermal energy very well. Which of the materials is most likely copper? A. material 3 B. material 2 C. material 4 D. material 1
Question
Rachel performed an investigation to study the thermal conductivity of four different materials. She started with four identically shaped rods—each made of a different material. Then, she placed one end of each rod into a pot of boiling water, which was at 100°C.After five minutes, Rachel measured the temperatures of the ends of the rods that were sticking up out of the pot to see whether they got hot. Her results are shown below.Thermal Conductivity InvestigationMaterial Temperature of End of RodAfter 5 MinutesMaterial 1 41°CMaterial 2 53°CMaterial 3 98°CMaterial 4 59°CRachel knows that one of the materials is copper and that copper conducts thermal energy very well. Which of the materials is most likely copper? A. material 3 B. material 2 C. material 4 D. material 1
Solution
The material that is most likely copper is Material 3. This is because copper is a good conductor of thermal energy, meaning it would have transferred the heat from the boiling water to the end of the rod more effectively than the other materials. This is reflected in the higher temperature of Material 3 compared to the other materials. So, the answer is A. Material 3.
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