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

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 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 ```