The long single bar on the left in the drawing has a thermal conductivity of 240 J/(s ∙ m ∙ C°). The ends of the bar are at temperatures of 400 and 200 °C, and the temperature of its midpoint is halfway between these two temperatures, or 300 °C. The two bars on the right are half as long as the bar on the left, and the thermal conductivities of these bars are different (see the drawing). All of the bars have the same cross-sectional area. What can be said about the temperature at the point where the two bars on the right are joined together?

(a) The temperature at the point where the two bars are joined together is 300 °C.

(b) The temperature at the point where the two bars are joined together is greater than 300 °C.

(c) The temperature at the point where the two bars are joined together is less than 300 °C.

Transcribed Image Text:

400 °C 200 °C 400 °C 200 °C 300 °C k 240 Js m -C°) 2-120 J/s-m co)