मराठी
तामिळनाडू बोर्ड ऑफ सेकेंडरी एज्युकेशनएचएससी विज्ञान इयत्ता ११

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

Advertisements
Advertisements

प्रश्न

State the second law of thermodynamics in terms of entropy.

टीपा लिहा

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.

shaalaa.com
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 8: Heat and Thermodynamics - Evaluation [पृष्ठ १५९]

APPEARS IN

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 efficiency of a heat engine working between the freezing point and boiling point of water is ____________.


State Kelvin-Planck's statement of the second law of thermodynamics.


Define heat engine.


Explain the heat engine and obtain its 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 ______.


The thermal efficiency of a heat engine is 25%. If in one cycle the heat absorbed from the hot reservoir is 50000 J, what is the heat rejected to the cold reservoir in one cycle?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×