1. A speeding motorcyclist sees traffic jam ahead of him. He slows down to \(36\, kmhour^{−1}\). He finds that traffic has eased and a car moving ahead of him at \(18\, kmhour^{−1}\) is honking at a frequency of \(1392\, Hz\). If the speed of sound is \(343\, ms^{−1}\), the frequency of the honk as heard by him will be