Two bars, A and B, each of length 2.0 m and cross sectional area 1.0 m2, are placed end to end as shown in the figure. The thermal conductivities of the bars are kA = 439 J/(s × m × K) and kB = 887 J/(s × m × K), respectively. The left end of bar A is maintained at 373 K while the right end of B is maintained at 273 K. Which one of the following statements is true concerning the above situation?
Energy transfer
The flow of energy from one region to another region is referred to as energy transfer. Since energy is quantitative; it must be transferred to a body or a material to work or to heat the system.
Molar Specific Heat
Heat capacity is the amount of heat energy absorbed or released by a chemical substance per the change in temperature of that substance. The change in heat is also called enthalpy. The SI unit of heat capacity is Joules per Kelvin, which is (J K-1)
Thermal Properties of Matter
Thermal energy is described as one of the form of heat energy which flows from one body of higher temperature to the other with the lower temperature when these two bodies are placed in contact to each other. Heat is described as the form of energy which is transferred between the two systems or in between the systems and their surrounding by the virtue of difference in temperature. Calorimetry is that branch of science which helps in measuring the changes which are taking place in the heat energy of a given body.
Two bars, A and B, each of length 2.0 m and cross sectional area 1.0 m2, are placed end to end as shown in the figure.
The thermal conductivities of the bars are
kA = 439 J/(s × m × K) and kB = 887 J/(s × m × K), respectively. The left end of bar A is maintained at 373 K while the right end of B is maintained at 273 K.
Which one of the following statements is true concerning the above situation?
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For a given time t, the amount of |
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For a given time t, the amount of heat transferred through bar A is smaller than that through B. |
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For a given time t, the amount of heat transferred through bar A is less than that through B. |
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The time for a quantity of heat Q to pass through bar A is less than that for B. |
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Time is not a factor in determining the quantity of heat |
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