Recent questions tagged chapter11

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If a body is heated from `27^o C` to `927^oC` then what will be the ratio of energies of radiation

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Two rods A and B are of equal length. Each rod has its ends at temperatures T1 and T2. What is the condition that will ensure equal rates of flow of heat through the rods A and

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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A layer of ice 10cm thick is formed on a pond. The temperature of air is `– 10^oC`. Calculate how long it will take for the thickness of ice to increase by 1mm. Density of ice` = 1g|cm^3`; Thermal conductivity of ice `= 0.005Cal|s|cm|^oC`; Latent heat of ice `= 80Cal|g`

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Two conducting slabs of thermal conductivities K1 and K2 are joined as shown in the figure. The temperature of the ends of slab are `θ_1 and θ_2 (θ_1 > θ_2)`. Find the final temperature of

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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The ends of the two rods of different materials with their thermal conductivities, radii of cross – section and length in the ratio 1:2 are maintained at the same temperature difference. If the rate of flow of heat through the larger rod is 4 cal |s, what is the rate of flow through the shorter

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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What are thermal radiation? Write its properties of thermal

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An indirectly heated filament is radiating maximum energy of wavelength `2.16xx 10^(-7)m`. Find the net amount of heat energy lost per second per unit area, the temperature of surrounding air is `13^oC`. Given `b = 2.88xx10^(-3) mk, σ = 5.77xx10(-8)

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Animals in the forest find shelter from cold in holes in the snow.

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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A brass boiler has a base area of `0.15m^2` and thickness 1.0cm. It boils water at the rate of 6kg| min when placed on a gas stove, Estimate the temperature of the part of flame in contact with the boiler. Thermal conductivity of brass `= 10^9J|s|m|'^oC`, heat of vaporization of water `=

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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How do you explain heating of rooms based on principle of

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Why is the energy of thermal radiation less than that of visible

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Two rods A and B are of equal length. Each rod has its ends at temperature T1 and T2 (T1 > T2). What is the condition that will ensure equal rates of flow through the rods A and

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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A Sphere is at a temperature of 6oo k. Its cooling rate is R in an external environment of 200k. If temperature falls to 400k. What is the cooling rate R1 in terms of

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If the temperature of the sun is doubled, the rate of energy received on each will increases by what

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How do you explain the emission of long - wavelength by the object at low

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If the radiation from the moon gives maxima at `λ = 4700 A^o and λ = 14xx10^(-6)m`. What conclusion can be drawn from the above

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Differentiate between conduction, convection and

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The tile floor feels colder than the wooden floor even though both floor materials are at same temperature.

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A spherical black body of radius 12cm radiates 450w power at 500k. If the radius were halved and the temperature doubled, what would be the power

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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A cylinder of radius R made of a material of thermal conductivity K1 is surrounded by a cylindrical shell of inner radius R and other radius 2R made of material of thermal conductivity K2. The 2 ends of combined system are maintained at two different temperatures. There is no loss of heat across the clinical surface and the system is in steady state calculate the effective thermal conductivity of the

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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