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Two rods (one semi-circular and other straight) ofsame material and of same cross-sectional area arejoined as shown in Fig. The points A and B aremaintained at different temperatures. The ratio of theheat transferred through a cross section of a semicircularrod to the heat transferred through a crosssection of the straight rod in a given time is
  • a)
    2:π
  • b)
    1 : 2
  • c)
    π : 2
  • d)
    3 : 2
Correct answer is option 'A'. Can you explain this answer?
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Importance of high specific heat capacity of water for life Specific heat capacity of a substance is the amount of heat required to raise the temperature of that substance by 1 K. It is expressed in the units J/ (kg K). A high specific heat of a substance means that a large amount of heat is required to raise the temperature of the substance. Water has the highest known specific heat capacity. Its specific heat capacity is 4.186 K J/ (kg K) i.e. to raise the temperature of 1 kg of water by 1 Kelvin it requires 4.186 KJ of heat. For comparison sake, Copper requires only 385 Joules of heat to raise 1 kilogram of copper by 1 Kelvin. It also interesting to know that the specific heat capacities in two other phases of water (i.e. ice and water vapour) are less than this. High specific heat of water is mainly due to the presence of a large number of hydrogen bonds between molecules of water. On a beach on a sunny day, it is noticed that the sand is often quite hot to walk on, but the water is always cool, even in the shallows. This is because sand has a lower specific heat capacity than that of water. Sand takes less energy to raise the temperature by one degree. Because water has a high specific heat capacity, it requires more energy to raise the temperature by one degree. Since the sun puts same rate of energy on water and sand, which heats up sand more quickly and water more slowly. Water covers around 70% of the Earth's surface and its high specific heat plays a very important role to sustain life in the earth. It is able to absorb a lot of heat without a significant rise in the temperature. When temperatures decrease, the heat which is stored is released, restraining a rapid drop in temperature. The combined effect is the buffering of heat. A relatively constant temperature without sudden rise and drop is essential to sustain life. Hence water is important for life.Q. Which statement is false?

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Two rods (one semi-circular and other straight) ofsame material and of same cross-sectional area arejoined as shown in Fig. The points A and B aremaintained at different temperatures. The ratio of theheat transferred through a cross section of a semicircularrod to the heat transferred through a crosssection of the straight rod in a given time isa)2:πb)1 : 2c)π : 2d)3 : 2Correct answer is option 'A'. Can you explain this answer?
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Two rods (one semi-circular and other straight) ofsame material and of same cross-sectional area arejoined as shown in Fig. The points A and B aremaintained at different temperatures. The ratio of theheat transferred through a cross section of a semicircularrod to the heat transferred through a crosssection of the straight rod in a given time isa)2:πb)1 : 2c)π : 2d)3 : 2Correct answer is option 'A'. Can you explain this answer? for Class 11 2024 is part of Class 11 preparation. The Question and answers have been prepared according to the Class 11 exam syllabus. Information about Two rods (one semi-circular and other straight) ofsame material and of same cross-sectional area arejoined as shown in Fig. The points A and B aremaintained at different temperatures. The ratio of theheat transferred through a cross section of a semicircularrod to the heat transferred through a crosssection of the straight rod in a given time isa)2:πb)1 : 2c)π : 2d)3 : 2Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 11 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Two rods (one semi-circular and other straight) ofsame material and of same cross-sectional area arejoined as shown in Fig. The points A and B aremaintained at different temperatures. The ratio of theheat transferred through a cross section of a semicircularrod to the heat transferred through a crosssection of the straight rod in a given time isa)2:πb)1 : 2c)π : 2d)3 : 2Correct answer is option 'A'. Can you explain this answer?.
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