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General
Easy
Question
The figure shows a radiant energy spectrum graph for a black body at a temperature T. Identify the graph which correctly represents the spectral intensity versus wavelength graph at two temperatures T' and T (T < T')
- none of these
The correct answer is:
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The figure shows a radiant energy spectrum graph for a black body at a temperature T. If the temperature of the body is raised to a higher temperature T', then choose the correct statement(s)
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=
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A composite rod made of three rods of equal length and cross-section as shown in the fig. The thermal conductivities of the materials of the rods are K/2, 5K and K respectively. The end A and end B are at constant temperatures. All heat entering the face A goes out of the end B there being no loss of heat from the sides of the bar. The effective thermal conductivity of the bar is
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Two rods A and B of different materials but same cross section are joined as in figure. The free end of A is maintained at 100°C and the free end of B is maintained at 0°C.
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The temperature drop through each layer of a two layer furnace wall is shown in figure. Assume that the external temperature T1 and T3 are maintained constant and T1 > T3. If the thickness of the layers x1 and x2 are the same, which of the following statements are correct
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Three identical rods AB, CD and PQ are joined as shown. P and Q are mid points of AB and CD respectively. Ends A, B, C and D are maintained at 0°C, 100°C, 30°C and 60°C respectively. The direction of heat flow in PQ is
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Three rods made of the same material and having same cross-sectional area but different lengths 10cm, 20 cm and 30 cm are joined as shown. The temperature of the joint is:
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Three conducting rods of same material and cross-section are shown in figure. Temperatures of A, D and C are maintained at 20°C, 90°C and 0°C. The ratio of lengths of BD and BC if there is no heat flow in AB is:
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A ring consisting of two parts ADB and ACB of same conductivity k carries an amount of heat H. The ADB part is now replaced with another metal keeping the temperatures T1 and T2 constant. The heat carried increases to 2H. What should be the conductivity of the new ADB part? Given 
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