The Sound from the Whistle of a Truck Moving at 17.0

Multiple Choice

The sound from the whistle of a truck moving at 17.0 m/s toward a cliff reflects from the cliff and is heard by the driver of the truck. When it is parked at the side of the road, the whistle from the
Truck produces sound of frequency 2.267 kHz. As observed by the driver of the truck, what is the
Change in frequency the sound from the whistle due to the reflection? The speed of sound is 343
M/s)

A) 228 Hz
B) 207 Hz
C) 472 Hz
D) 236 Hz
E) 118 Hz