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A block having some emissivity is maintained at 500 K temperature in a surrounding of 300K temperature. It is observed that, to maintain the temperature of the block, 210 W 210 W A block having some emissivity is maintained at 500 K temperature in a surrounding of 300K temperature. It is observed that to maintain [...]

A spherical black body with a radius of 12 cm placed in space radiates 450 W power at 500 K. If the radius were halved and the temperature doubled, find the power radiated A spherical black body with a radius of 12 cm placed in space radiates 450 W power at 500 K. If the [...]

A rod AB of uniform cross-section consists of four sections AC, CD, DE and EB of different metals with thermal conductivities K, 0.8K, 1.2K and 1.50 K, respectively. Their lengths are 0.8K 1.2K and 1.50 K A rod AB of uniform cross-section consists of four sections AC CD DE and EB of different metals with [...]

A copper rod (initially at room temperature 20 C) of non-uniform cross-section is placed between a steam chamber at 100 C and ice water chamber at 0 C. A and B are cross sections A copper rod (initially at room temperature 20 C) of non-uniform cross-section is placed between a steam chamber at 100 C [...]

The surface of a household radiator has an emissivity of 0.55 and an area of 1.5 m^2. Its equilibrium temperature is 50 C and the surroundings are at 22 C The surface of a household radiator has an emissivity of 0.55 and an area of 1.5 m^2. Its equilibrium temperature is 50 C and the [...]

Two spherical black bodies A and B, having radii rA and rB = 2rA emit radiation with peak intensities at wavelength 400 nm and 800 nm respectively. If their temperature are TA and TB having radii rA and rB = 2rA emit radiation with peak intensities at wavelength 400 nm and 800 nm respectively. If [...]

A metal cylinder of mass 0.5 kg is heated electrically by a 12 W heater in a room at 15 C. The cylinder temperature rises uniformly to 20 C in 5 min and finally becomes constant at A metal cylinder of mass 0.5 kg is heated electrically by a 12 W heater in a room [...]

Two ends of area A of a uniform rod of thermal conductivity K are maintained at different but constant temperatures. At any point on the rod, the temperature gradient is dT/dl. the temperature gradient is dT/dl. Two ends of area A of a uniform rod of thermal conductivity K are maintained at different but constant [...]

The two ends of a uniform rod of thermal conductivity k are maintained at different but constant temperatures. The temperature gradient at any point on the rod is d theta / d l The two ends of a uniform rod of thermal conductivity k are maintained at different but constant temperatures. The temperature gradient at [...]

Two spheres A and B have same radius but the heat capacity of A is greater than that of B. The surfaces of both are painted black. They are heated to the same temperature and allowed to cool. Two spheres A and B have same radius but the heat capacity of A is greater than [...]