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प्रश्न
Explain, why is water sprayed on roads in evening in hot summer?
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उत्तर
Water has the highest specific heat capacity of 4.2 Jg-1 °C-1. Thus, water absorbs large amount of heat from the roads, but its own temperature does not rise much. Thus, on the whole the roads get cooled.
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संबंधित प्रश्न
Name and state the principle used to measure the specific heat capacity of a substance.
The ratio of specific heat capacity to molar heat capacity of a body _____________ .
m kg of a substance of specific heat capacity s J/kg °C is heated so that its temperature rises from θ1°C to θ2°C. Write down the expression for the heat Q supplied.
Why is specific heat capacity taken as a measure of thermal inertia?
Is it possible to condense the water formed, back to ice by adding ice at 0°C. Explain with reason.
A vessel of negligible heat*capacity contains 40g of ice in it at 0°C, 8g of steam at 100°C is passed into the ice to melt it. Find the final temperature of the contents of the vessel.
(Specific latent heat of vaporization of steam = 2268 J/g, specific latent heat of fusion of ice = 336 J/f and specific heat capacity of water = 4.2 J/g°C)
Solve the following problem.
Specific latent heat of vaporization of water is 2.26 × 106 J/kg. Calculate the energy needed to change 5.0 g of water into steam at 100 ºC.
Which of the following substances (A, B and C) has the highest specific beat?
Give one example where high specific heat capacity of water is used as heat reservoir.
