Physics
Heat
Easy

Question

When an ideal gas left parenthesis gamma equals 5 divided by 3 right parenthesis heated under constant pressure, what percentage of given heat energy will be utilized in doing external work?

  1. 40%
  2. 30%
  3. 60%
  4. 20%

The correct answer is: 40%


    fraction numerator straight capital delta W over denominator straight capital delta Q end fraction equals fraction numerator straight capital delta Q minus straight capital delta U over denominator straight capital delta Q end fraction equals fraction numerator C subscript p minus C subscript v over denominator C subscript p end fraction equals 1 minus 1 over gamma equals 1 minus fraction numerator 1 over denominator 1 minus 5 over 3 end fraction equals 2 over 5
text  i.e., percentage energy utilized in doing external work  end text
equals 2 over 5 cross times 100 equals 40 straight percent sign

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