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Answer the following question. Why do we generally consider two specific heats of a gas? - Physics

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प्रश्न

Answer the following question.

Why do we generally consider two specific heats of a gas?

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उत्तर

  1. A slight change in temperature causes a considerable change in pressure as well as the volume of the gas.
  2. Therefore, two principal specific heats are defined for a gas viz., specific heat capacity at constant volume (SV), and specific heat capacity at constant pressure (SP).
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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 7: Thermal Properties of Matter - Exercises [पृष्ठ १४०]

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बालभारती Physics [English] Standard 11 Maharashtra State Board
पाठ 7 Thermal Properties of Matter
Exercises | Q 2. (vii) | पृष्ठ १४०

संबंधित प्रश्‍न

What do you understand by the following statements:

The heat capacity of the body is 60JK-1.


Heat supplied to a solid change it into liquid. What is this change in the phase called?


During the phase change does the average kinetic energy of the molecules of the substance increase?


The temperature of 170 g of water at 50°C is lowered to 5°C by adding a certain amount of ice to it. Find the mass of ice added.

Given: Specific heat capacity of water = 4200 J kg-1 °C-1 and specific latent heat of ice = 336000 J kg-1.


Write the approximate value of specific heat capacity of water in S.I. unit.


A mass m1 of a substance of specific heat capacity c1 at temperature t1 is mixed with a mass m2 of other substance of specific heat capacity c2 at a lower temperature t2. Deduce the expression for the temperature t of the mixture. State the assumption made, if any.


A heater of power P watt raises the temperature of m kg of a liquid by Δt K in time t s. Express
the specific heat capacity of liquid in terms of above data.


The S.I. unit of specific heat capacity is ______.


Find the time taken by a 500 W heater to raise the temperature of 50 kg of material of specific heat capacity 960 J kg-1K-1, from 18°C to 38° C. Assume that all the heat energy supplied by the heater is given to the material.


Define the term 'specific heat capacity' and state its unit.


Does the specific heat depend upon the temperature?

Write down the relation between specific heat and heat capacity.

Specific heat capacity of a substance A is 3.8 J g-1 K-1 and of substance B is 0.4 J g-1 k-1. Which substance is a good conductor of heat? How did you arrive at your conclusion?


The farmers fill their fields with water in winter. Give reason.


Why is specific heat capacity taken as a measure of thermal inertia?


Explain, why water is considered as best liquid for quenching thirst?


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.


An equal quantity of heat is supplied to two substances A and B. The substance A shows a greater rise in temperature. What can you say about the heat capacity of A as compared to that of B?


A substance is in the form of a solid at 0°C. The amount of heat added to this substance and the temperature of the substance are plotted on the following graph:

If the specific heat capacity of the solid substance is 500 J/kg °G, find from the graph, the mass of the substance.


Calculate the amount of heat released when 5.0 g of water at 20°C is changed into ice at 0°C.
(Specific heat capacity of water = 4.2 J/g°C
Specific latent heat of fusion of ice = 336 J/g)


An electric immersion heater is rated 1250 W. Calculate the time in which it will heat 20 kg of water at 5°C to 65°C.


All metals have the same specific heat capacity.


Decide the unit for specific heat capacity.


A monoatomic gas of pressure 'P' having volume 'V' expands isothermally to a volume '2V' and then adiabatically to a volume '16V'. The final pressure of the gas is ______.
(ratio of specific heats = `5/3`)


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 the mass ratio of metal A and metal B is 3:5 then calculate the ratio in which their temperatures rise.


Water has the lowest specific heat capacity.


Which of the following substances (A, B and C) has the highest specific heat? 

 


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