Physics
Heat
Easy
Question
The temperature of a body is increased by 50%. The 4amount of radiation emitted by it would be nearly
- 50%
- 225%
- 250%
- 400%
The correct answer is: 400%
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A black body is heated from 7oC to 287oC. The ratio of radiation emitted is:
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The rate of dissipation of heat by a black body at temperature T is Q. What will be the rate of dissipation of heat by another body at temperature 2T and emissivity 0.25?
The rate of dissipation of heat by a black body at temperature T is Q. What will be the rate of dissipation of heat by another body at temperature 2T and emissivity 0.25?
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A black body at a high temperature TK radiates energy at the rate of EW/m2. When the temperature falls to (T/2) K, the radiated energy will be:
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Two identical long, solid cylinders are used to conduct heat from temp T1 to temp T2. Originally the cylinders are connected in series and the rate of heat transfer is H. If the cylinders are connected in parallel then the rate of heat transfer would be:
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Three rods made of the same material and having the same cross section have been joined as shown in the figure. Each rod is of the same length. The left and right ends are kept at 0°C and 90°C respectively. The temperature of the junction of the three rods will be
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If l is the length, A is the area of cross-section and K the thermal conductivity, then the thermal resistance of the block is given by
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The ratio of the densities of the two bodies is 3:4 and the ratio of specific heats is 43. Find the ratio of their thermal capacities for unit volume?
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Two bars of thermal conductivities K and 3K and lengths 1 cm and.2 cm respectively have equal cross-sectional area, they are joined lengths wise as shown in the figure.
If the temperature at the ends of this composite bar is 0°C and Kll respectively (see figure), then the temperature 
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If the temperature at the ends of this composite bar is 0°C and Kll respectively (see figure), then the temperature of the interface is
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One kilogram of ice at 0o C is mixed with one kilogram of water at 80oC. The final temperature of the mixture is (Take specific heat of water=4200Jkg-1K-1 , Latent heat of ice=336KJ/kg-1)
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The root mean square speed of hydrogen molecules at a certain temperature is 300m/s. If the temperature is doubled and hydrogen gas dissociates into atomic hydrogen, the rms speed will become:
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At what temperature does the average translational kinetic energy of a molecule in a gas become equal to kinetic energy of an electron accelerated from rest through a potential difference of 1 volt ?(k=1.38x10-23J/k)
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