Joint Entrance Examination/AIEEE 2009/Q072 ENERGY


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Original Question by 164.100.170.4

Here's the question...

Q72. One kg of diatomic gas is at a pressure of 8 × 104 N/m2. The density of the gas is 4 kg/m3. What is the energy of the gas due to its thermal motion?

  • (1) 5 × 104 J
  • (2) 6 × 104 J
  • (3) 7 × 104 J
  • (4) 3 × 104 J

Posted by 164.100.170.4 05:06, 24 September 2009 (UTC)

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Reply to the thread, posted by 164.100.170.4

Thread post

Additional notes

SOLUTION:[1] E= [f/2]PV f=degree of freedoms.For diatomic gas under normal temp.f=5 [3-translation,2-vibration]

E=5/2 PV

=5/2P*m/ρ
=[5*8*104*1]/[2*4]
=5*104 J
These comments, along with the notes on the left, were contributed by 164.100.170.4 05:16, 24 September 2009 (UTC)