A train moves towards a stationary observer with speed 34 m/s. The train sounds a whistle and its frequency registered by the observer is \[{{f}_{1}}\]. If the train?s speed is reduced to 17 m/s, the frequency registered is \[{{f}_{2}}\]. If the speed of sound is 340 m/s then the ratio \[{{f}_{1}}/{{f}_{2}}\] is [IIT-JEE (Screening) 2000]

• A.            18/19                                       
• B.            1/2
• C.            2    
• D.            19/18