A) 10 kJ
B) 0.9 KJ
C) 14 kJ
D) 6 kJ
Correct Answer: A
Solution :
To double the rms speed, temp is increased to 4 times \[{{T}_{1}}=300\,K\] \[{{T}_{2}}=300\times 4=1200\text{ }K\] \[\Delta \,T=1200-300=900\text{ }K\] \[Q\,\,=\,\,n{{C}_{V}}\Delta T\,=\,\frac{15}{28}\,\times \frac{5}{2}\,\,\times \,\,R\,\,\times \,\,900\] \[Q=10\,KJ\]
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