Part 1
If wavelengths of maximum intensity of radiations emitted by the sun and the moon are 0.5×10^−6m and 10^−4m respectively, the ratio of their temperature is
19
Nov
If wavelengths of maximum intensity of radiations emitted by the sun and the moon are 0.5×10^−6m and 10^−4m respectively, the ratio of their temperature is If wavelengths of maximum intensity of radiations emitted by the sun and the moon are 0.5×10^−6m and 10^−4m respectively the ratio of their temperature is November 19, 2020 Category: Chapter [...]
The absolute temperature of a body A is four times that of another body B. For the two bodies, the difference in wavelengths, at which energy radiated is maximum is 3 μ . Then, the wavelength, at which the body B radiates maximum energy, in micrometer, is:
19
Nov
The absolute temperature of a body A is four times that of another body B. For the two bodies, the difference in wavelengths, at which energy radiated is maximum is 3 μ . Then, the wavelength, at which the body B radiates maximum energy, in micrometer, is: at which energy radiated is maximum is 3 [...]
Three identical metal rods, X, Y and Z are placed end to end and a temperature difference is maintained between the ends of X and Z. If the thermal conductivity of Y(Ky) is twice that of Z (Kz) and half that of X (Kx), then the effective thermal conductivity of the system is
19
Nov
Three identical metal rods, X, Y and Z are placed end to end and a temperature difference is maintained between the ends of X and Z. If the thermal conductivity of Y(Ky) is twice that of Z (Kz) and half that of X (Kx), then the effective thermal conductivity of the system is then the [...]
The temperature of the two outer surfaces of a composite slab, consisting of two materials having coefficients of thermal conductivity K and 2K and thickness x and 4x, respectively are T2 and T1(T2>T1). The rate of heat transfer through the slab, in a steady state is (A(T2−T1)K/x) f, with f equals to (a) 1 (b) 1/2 (c) 2/3 (d) 1/3
19
Nov
The temperature of the two outer surfaces of a composite slab, consisting of two materials having coefficients of thermal conductivity K and 2K and thickness x and 4x, respectively are T2 and T1(T2>T1). The rate of heat transfer through the slab, in a steady state is (A(T2−T1)K/x) f, with f equals to (a) 1 (b) [...]
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consisting of two materials having coefficients of thermal conductivity K and 2K and thickness x and 4x ,
in a steady state is (A(T2−T1)K/x) f ,
respectively are T2 and T1(T2>T1). The rate of heat transfer through the slab ,
The temperature of the two outer surfaces of a composite slab ,
with f equals to (a) 1 (b) 1/2 (c) 2/3 (d) 1/3 ,
Two metallic rods PQ and QR of different materials are joined together at the junction Q (see figure). It is observed that if the ends P and R are kept at 100^o C and 0^o C respectively, the temperature of the junction Q is 60^o C, there is no loss of heat to the surroundings. The rod QR is replace by another rod QR ′ of the same material and length (QR = QR′ ). If the area of cross-section of QR′ is twice that of QR and the ends P and R ′ are maintained at 100^o C and 0^o C respectively, the temperature of the junction Q will be nearly
19
Nov
Two metallic rods PQ and QR of different materials are joined together at the junction Q (see figure). It is observed that if the ends P and R are kept at 100^o C and 0^o C respectively, the temperature of the junction Q is 60^o C, there is no loss of heat to the surroundings. [...]
A cylinder of radius R made of a material of thermal conductivity K1, is surrounded by a cylindrical shell of inner radius R and outer radius 2R made of a material of thermal conductivity K2. The two ends of the combined system are maintained at two different temperatures. There is no loss of heat across the cylindrical surface and the system is in steady state. The effective thermal conductivity of the system is
19
Nov
A cylinder of radius R made of a material of thermal conductivity K1, is surrounded by a cylindrical shell of inner radius R and outer radius 2R made of a material of thermal conductivity K2. The two ends of the combined system are maintained at two different temperatures. There is no loss of heat across [...]
A body of A mass 0.5kg and specific heat 0.85 at temperature 60degree celsius. Another body B of mass 0.3kg and specific heat 0.9 at temperature of 90 degree celsius when they are connected through a conducting rod heat will flow from
19
Nov
A body of A mass 0.5kg and specific heat 0.85 at temperature 60degree celsius. Another body B of mass 0.3kg and specific heat 0.9 at temperature of 90 degree celsius when they are connected through a conducting rod heat will flow from The latent heat of vaporisation of a substance is always November 19, 2020 [...]
Two identical rectangular rods of metal are welded end to end as shown in figure (a) and 10 j of heat flow through the rods in 2.00 min. How long would it take for 30 j of heat to flow through the rods if they are welded as shown in figure (b) ?
19
Nov
Two identical rectangular rods of metal are welded end to end as shown in figure (a) and 10 j of heat flow through the rods in 2.00 min. How long would it take for 30 j of heat to flow through the rods if they are welded as shown in figure (b) ? The latent [...]
Two metal rods 1 and 2 of same lengths have same temperature difference between their ends. Their thermal conductivities are K1 and K2 and cross sectional areas A1 and A2 respectively. If the rate of heat conduction in 1 is four times that in 2, then
19
Nov
Two metal rods 1 and 2 of same lengths have same temperature difference between their ends. Their thermal conductivities are K1 and K2 and cross sectional areas A1 and A2 respectively. If the rate of heat conduction in 1 is four times that in 2, then The latent heat of vaporisation of a substance is [...]
The coefficient of thermal conductivity of copper is 9 times that of steel. In the composite cylindrical bar shown in the figure, what will be the temperature at the junction of copper and steel ?
19
Nov
The coefficient of thermal conductivity of copper is 9 times that of steel. In the composite cylindrical bar shown in the figure, what will be the temperature at the junction of copper and steel ? The coefficient of thermal conductivity of copper is 9 times that of steel. In the composite cylindrical bar shown in [...]