Recent questions in 11th Physics

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From what height should a piece of ice fall so that it completely melts? Only one – quarter of heat produced is absorbed by the ice. Given latent heat of ice is `3.4 × 10^5 J | Kg` and acceleration due to gravity, `g = 10m| s^2`

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

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On a winter night, you feel warmer when clouds cover the sky than when sky is clear.

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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

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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

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

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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

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

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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.

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

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