Some Helps with the Concepts! Thermodynamics of Material Engineering. 16. A 1-di

Question

Some Helps with the Concepts!

Thermodynamics of Material Engineering.

16. A 1-dimensional classic harmonic oscillator at temperature Thas an average energy equal to: (a) kT/2 (b) kT (c) 3kT/2 (d) 2KT (e) SkT/2 17. Which of the following statement is correct for constant-volume heat capacity (C)? (a) Cy of one mole gas equals 3R/2 (b) the internal energy of a material is proportional to its C (c) the enthalpy of a material is proportional to its C (d) Cy is proportional to the change of entropy to temperature (e) C is a constant value for all elemental solids (e. g. Cu, Au, Al, Fe.. 18. A binary A-B solution behaves ideally both in liquid and solid and exhibits complete mutual solid/liquid solubility. At a temperature which is between melting point of A and melting point of B, the activities of component B will be (a) aa=Xa (b) aa,, (c) a,-xa/Xa (d) a,-constant (e) as may have two values for each of Xg. 19. An ideal gas at 300 K has a volume of 15 liters at a pressure of 15 atm. When the gas undergoes a reversible isothermal expansion to a pressure of 10 atm, the change in internal energy of the system is (a)0 (b) 98019244 (d) 273( (e) 1033 J

Explanation / Answer

Ans 16 b) KT

The average kinetic energy of a one - dimensional simple harmonic oscillator at temperature T is KT.

It is basically the sum of kinetic energy and potential energy , the terms that include mass , momentum , displacement and force constant.

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