On a cold morning, a metal surface will feel colder to touch than a wooden surface because
Metal has high specific heat
Metal has high thermal conductivity
Metal has low specific heat
Metal has low thermal conductivity
Two different rods AA and BB are kept as shown in figure. The ratio of thermal conductivities of AA and BB is
Snow is more heat insulating than ice, because
The temperature θθ at the junction of two insulating sheets, having thermal resistances R1R1 and R2R2 as well as top and bottom temperatures θ1θ1 and θ2θ2 (as shown in figure) is given by
Two identical rods of copper and iron are coated with wax uniformly. When one end of each is kept at temperature of boiling water, the length upto which wax melts are 8.4cm8.4cm and 4.2cm4.2cm respectively. If thermal conductivity of copper is 0.920.92 , then thermal conductivity of iron is
Two cylinders PP and QQ have the same length and diameter and are made of different materials having thermal conductivities in the ratio 2:32:3 . These two cylinders are combined to make a cylinder. One end of PP is kept at 100°C100°C and another end of QQ at 0°C0°C . The temperature at the interface of PP and QQ is ...... oCoC