Advertisements
Advertisements
प्रश्न
Explain how heat capacity of a solid can be determined by the method of mixture.
Advertisements
उत्तर
- The solid object whose specific heat is to be determined is heated and then put in water in a calorimeter.
- Solid object loses heat energy to water and calorimeter till temperature of all three become equal.
- According to principle of heat exchange,
Heat lost by a solid object (Q) = Heat gained by calorimeter (Q1) + Heat gained by water in the calorimeter (Q2)
This means,
mass of the solid object × its specific heat × in its temperature
= (mass of the calorimeter × its specific heat × increase in its temperature) + (mass of the water × its specific heat × increase in its temperature). - Using this equation, if the specific heat of water and calorimeter are known and other physical quantities are measured accurately, the specific heat of solid object can be determined.
APPEARS IN
संबंधित प्रश्न
Define heat capacity and state its SI unit.
Why do the farmers fill their fields with water on a cold winter night?
Discuss the role of high specific heat capacity of water with reference to climate in coastal areas.
Explain the term boiling ?
Name the radiations for which the green house gases are transparent ?
Study the following procedure and answer the questions below:
1. Take 3 spheres of iron, copper and lead of equal mass.
2. Put all the 3 spheres in boiling water in a beaker for some time.
3. Take 3 spheres out of the water. Put them immediately on a thick slab of wax.
4. Note, the depth that each sphere goes into the wax.
i) Which property of substance can be studied with this procedure?
ii) Describe that property in minimum words.
iii) Explain the rule of heat exchange with this property.
A substance is heated at a constant rate from a low temperature to a high temperature. A graph of temperature against time is shown in the figure. Which part or parts of the graph correspond(s) to the substance existing in two states?
Explain, why temperature in hot summer, falls sharply after a sharp shower?
If substances A and B are liquids then which one would be more useful in car radiators?
Given: Specific heat capacity’A’ 3.8 J/g /K. Specific heat capacity ‘B’ 0.4 J/g /K.
A piece of ice is heated at a constant rate. The variation of temperature with heat input is shown in the graph below:
(i) What are represented by AB and CD?
(ii) What conclusion can you draw regarding the 110°c nature of ice from the above graph?
A. hot solid of mass 60 g at 100°C is placed in 150 g of water at 20° C. The final steady temperature recorded is 25°C. Calculate the specific heat capacity of the solid. [Specific heat capacity of water = 4200 J kg-1 °C-1]
How much heat energy is necessary to raise the temperature of 5 kg of water from 20°C to 100°C?
Which of the following substances (A, B and C) has the highest specific beat?
The value of 'γ' for a gas is given as `gamma = 1 + 2/"f"`, where 'f ' is the number of degrees of freedom of freedom of a molecule of a gas. What is the ratio of `gamma_"monoatonic"//gamma_"diatomic"`?
Diatomic gas consists of rigid gas molecules
An office room contains about 4000 moles of air. The change in the internal energy of this much air when it is cooled from 34° C to 19° C at a constant pressure of 1.0 atm is (Use `gamma_"air"` = 1.4 and Universal gas constant = 8.314 J / mol K) ____________.
Two metals A and B have specific heat capacities in the ratio 2:3. If they are supplied same amount of heat then
If specific heat capacity of metal A is 0.26 Jg-1 0C-1 then calculate the specific heat capacity of metal B.
Two cylinders of equal height and radius are made of copper and aluminum. Which of them conducts heat faster?
In the method of mixtures, a hot metal is dropped into cold water and the mixture reaches a final temperature. Which principle is used to find the specific heat of the metal?
