Chapter 16 – Calorimetry and Heat Transfer
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Two black bodies at temperatures 327ºC and 427ºC are kept in an evacuated chamber at 27ºC. The ratio of their rates of loss of heat are :
19
Nov
Two black bodies at temperatures 327ºC and 427ºC are kept in an evacuated chamber at 27ºC. The ratio of their rates of loss of heat are : Two black bodies at temperatures 327ºC and 427ºC are kept in an evacuated chamber at 27ºC. The ratio of their rates of loss of heat are : November [...]
The maximum spectral emissive power of a black body at a temperature of 5000 K is obtained as λm = 6000 Å. If the temperature is increased by 10%, then the decrease in λm will be
19
Nov
The maximum spectral emissive power of a black body at a temperature of 5000 K is obtained as λm = 6000 Å. If the temperature is increased by 10%, then the decrease in λm will be The maximum spectral emissive power of a black body at a temperature of 5000 K is obtained as λm [...]
Three stars A,B,C have surface temperatures TA,TB and TC. A appears bluish, B appears reddish and C appears yellowish. We can conclude that
19
Nov
Three stars A,B,C have surface temperatures TA,TB and TC. A appears bluish, B appears reddish and C appears yellowish. We can conclude that B B appears reddish and C appears yellowish. We can conclude that C have surface temperatures TA TB and TC. A appears bluish Three stars A November 19, 2020 Category: Chapter 16 [...]
The surface temperature of the sun which has maximum energy emission at 500 nm is 6000 K. The temperature of star which has maximum energy emission at 400 nm will be.
19
Nov
The surface temperature of the sun which has maximum energy emission at 500 nm is 6000 K. The temperature of star which has maximum energy emission at 400 nm will be. The surface temperature of the sun which has maximum energy emission at 500 nm is 6000 K. The temperature of star which has maximum [...]
The maximum energy is the thermal radiation from a hot source occurs at a wavelength of 11×10^−5cm. According to Wien’s law, the temperature of the source (on Kelvin scale) for which the wavelength at mixture energy is 5.5×10^−5 cm. The value of n is:
19
Nov
The maximum energy is the thermal radiation from a hot source occurs at a wavelength of 11×10^−5cm. According to Wien’s law, the temperature of the source (on Kelvin scale) for which the wavelength at mixture energy is 5.5×10^−5 cm. The value of n is: The maximum energy is the thermal radiation from a hot source [...]
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:
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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
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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. [...]