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Animals curl into a ball, when they feel very
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Why is it hotter at the same distance over the top of the fire than in front of
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A metal rod of length 20cm and diameter 2cm is covered with a non-conducting substance. One of it ends is maintained at `100^oc` while the other is at `0^oc`. It is found that 25g of ice melts in 5 min calculate coefficient of thermal conductivity of
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Calculate the temperature in Kelvin at which a perfectly black body radiates at the rate of 5.67
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How do you derive Newton’s law of cooling from Stefan’s
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Define the terms reflectance, absorptance and transmittance. How are they
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Discuss briefly energy distribution of a black body radiation. Hence deduce wien’s displacement
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Can you design heat energy of 100%
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Does the working of an electric refrigerator defy second law of
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A Carnot engine absorb `6×10^5` cal at `227^oc` calculate work done per cycle by the engine if it sink is at
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How does second law of thermodynamics explain expansion of
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Calculate difference in efficiency of a Carnot energy working between:-1) 400K and 350K2) 350K and
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Derive an expression for the work done during isothermal
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Briefly describe a Carnot cycle and derive an expression for the efficiency of Carnot
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What is an ideal perfect
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State Charles’s law? If air is filled in a vessel at `60^oc`. To what temperature should it be heated in order that `1/3^(rd)` of air may escape out of
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Show that average kinetic energy of translation per molecule of gas is directly proportional to the absolute temperature of
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Air pressure in a car tyre increases during driving?
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Four molecules of gas have speeds 2, 4, 6, 8, km/s. respectively. Calculate 1) Average speed 2) Root Mean square
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Derive Avogadro’s
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