Situation 15.1 A Train Is Approaching a Signal Tower at a Speed

question 17

Multiple Choice

Situation 15.1
A train is approaching a signal tower at a speed of 40 m/s.The train engineer sounds the 1000 Hz whistle and a switchman in the tower responds by sounding the 1200 Hz siren.The air is still and the speed of sound is 340 m/s.
-In Situation 15.1,the frequency of the train whistle tone,heard by the switchman,in SI units,is given by:

• A)1000
• B)300/340 × 1000
• C)340/300 × 1000
• D)340/380 × 1000
• E)380/340 × 1000

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