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Define specific heat capacity. - Science

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प्रश्न

Define specific heat capacity.

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उत्तर

The specific heat capacity of a substance is defined as the amount of heat energy required to raise the temperature of 1 kilogram of a substance by 1°C or 1 K. It is denoted by the symbol C.

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अध्याय 4: Heat - Exercises [पृष्ठ ४४]

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सामाचीर कलवी Science [English] Class 8 TN Board
अध्याय 4 Heat
Exercises | Q VI. 6. | पृष्ठ ४४

संबंधित प्रश्न

In an experiment on the specific heat of a metal, a 0.20 kg block of the metal at 150 °C is dropped in a copper calorimeter (of water equivalent 0.025 kg) containing 150 cm3 of water at 27 °C. The final temperature is 40 °C. Compute the specific heat of the metal. If heat losses to the surroundings are not negligible, is your answer greater or smaller than the actual value for the specific heat of the metal?


You have a choice of three metals A, B, and C, of specific heat capacities 900 Jkg-1 °C-1, 380 Jkg-1 °C-1 and 460 Jkg-1 °C-1 respectively, to make a calorimeter. Which material will you select? Justify your answer.


A solid metal weighing 150 g melts at its melting point of 800 °C by providing heat at the rate of 100 W. The time taken for it to completely melt at the same temperature is 4 min. What is the specific latent heat of fusion of the metal?


An electric heater of power 600 W raises the temperature of 4.0 kg of a liquid from 10.0℃ to 15.0℃ in100 s. Calculate:

  1. the heat capacity of 4.0 kg of liquid,
  2. the specific heat capacity of the liquid.

A piece of iron of mass 2.0 kg has a heat capacity of 966 J K-1. Find its specific heat capacity in S.I unit.


Explain, Why is it advisabile to pour cold water over burns, caused on human body, by hot solids?


Will the value of specific heat’capacity and specific latent heat of a substance change if the scale is °F instead of °C?


Read this activity and answer the following questions.

  1. Take three spheres of iron, copper and lead. the lead of equal mass.
  2. Put all the three spheres in boiling water in the beaker for some time.
  3. Take the three spheres out of the water.
  4. All the spheres will be at a temperature 100 °C.
  5. Put them immediately on the thick slab of wax.
  6. Note, the depth that each of the sphere goes into the wax.

Questions:

  1. Which property is determined from this activity?
  2. Give name to that property.
  3. Explain the term principal of heat exchange with the help of this activity.

On supplying 100 µC of charge to a conductor, its potential rises by 5 V then capacity of the conductor is ______.


Prove the Mayer's relation `C_p - C _v = R/J`


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