$R =8.32\,J \,mol ^{-1} k ^{-1}$ લો.
\(v _{ rms } \propto \sqrt{300\,K }, v _{ rms _{ f }}=2 v _{ rms _{ i }}\)
\(v _{ rms _{ f }} \propto \sqrt{1200\,K }\)
\(T _{ f }=1200\,K , T _{ i }=300 K , n =\frac{14}{28}=\frac{1}{2}\)
\(Q = nC _{ v } \Delta T =\frac{1}{2} \times \frac{5 R }{2} \times 900\)
\(Q =9360\,J\)