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State the second law of thermodynamics in terms of entropy. - Physics

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प्रश्न

State the second law of thermodynamics in terms of entropy.

टीपा लिहा
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उत्तर

“For all the processes that occur in nature (irreversible process), the entropy always increases. For reversible process entropy will not change”. Entropy determines the direction in which natural processes should occur.

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पाठ 8: Heat and Thermodynamics - Evaluation [पृष्ठ १५९]

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सामाचीर कलवी Physics - Volume 1 and 2 [English] Class 11 TN Board
पाठ 8 Heat and Thermodynamics
Evaluation | Q II. 46. | पृष्ठ १५९

संबंधित प्रश्‍न

A gas contained in a cylinder surrounded by a thick layer of insulating material is quickly compressed has there been a transfer of heat?


Draw a p-V diagram and explain the concept of positive and negative work. Give one example each.


The figure shows the V-T diagram for one cycle of a hypothetical heat engine which uses the ideal gas. Draw the p-V diagram diagram of the system.


Why does heat flow from a hot object to a cold object?


Derive the expression for Carnot engine efficiency.


Suppose a person wants to increase the efficiency of the reversible heat engine that is operating between 100°C and 300°C. He had two ways to increase efficiency.

  1. By decreasing the cold reservoir temperature from 100°C to 50°C and keeping the hot reservoir temperature constant
  2. by increasing the temperature of the hot reservoir from 300°C to 350°C by keeping the cold reservoir temperature constant.

Which is the suitable method?


A heat engine operates between a cold reservoir at temperature T2 = 400 K and a hot reservoir at temperature T1. It takes 300 J of heat from the hot re ervoir and delivers 240 J of heat to the cold reservoir in a cycle. The minimum temperature of the hot reservoir has to be ______ K.


Let η1 is the efficiency of an engine at T1 = 447°C and T2 = 147°C while η2, is the efficiency at T1 = 947°C and T2 = 47°C. The ratio `eta_1/eta_2` will be ______.


Draw a neat labelled P - V diagram for a typical heat engine. 


Mention any two elements of a heat engine.


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