Thermodynamics-Laws of Thermodynamics (NEST (National Entrance Screening Test) Physics): Questions 1 - 2 of 2
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Question number: 1
» Thermodynamics » Laws of Thermodynamics » First Law of Thermodynamics
Appeared in Year: 2019
Describe in Detail
A particle of mass moving in one – dimension satisfies the modified Schrodinger equation
Where is the velocity of the substrate. If now this particle is treated as Gaussian wave packet peaked at wave number , its group velocity will be
Explanation
Given
Treating it as a plane wave solution
Replacing and
Group velocity
Question number: 2
» Thermodynamics » Laws of Thermodynamics » First Law of Thermodynamics
Appeared in Year: 2019
Describe in Detail
An ideal gas engine is run according to the cycle shown in the diagram below, where the process from to is known to be isochoric (i. e. maintaining constant).
Image Shows the Corresponding Cycle
Explanation
Since is isothermal process, and entropy is decreasing, so volume also decreases.
This condition can be checked from option for .
In process to , volume is constant (isochoric) so pressure temperature. Here temperature is decreasing in , so pressure also decreases from to .
Hence correct option –
Image Shows the Correct Option
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