A train moves towards a stationary observer with speed 34m/s. The train sounds a whistle and its frequency registered by the observer is f1. If the train’s speed is reduced to 17m/s, the frequency registered is f2. If the speed of sound is 340m/s, then the ratio f1/f2 is?

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Wave topics include: Waves-transverse, longitudinal, progressive, travelling, stationary, superposition and sound waves, reverberation, acoustics and beats.   A wave is a disturbance that propagates dynamically. Waves can have many characteristics, including: Amplitude: The maximum displacement of a wave, measured in meters Frequency: A characteristic of waves that can be used to measure them Wavelength: A significant variable used to define wave characteristics Period: A characteristic of waves Speed: A characteristic of waves Phase: A characteristic of waves  Waves can be... Show more

A train moves towards a stationary observer with speed 34m/s. The train sounds a whistle and its frequency registered by the observer is f<sub>1</sub>. If the train’s speed is reduced to 17m/s, the frequency registered is f<sub>2</sub>. If the speed of sound is 340m/s, then the ratio f<sub>1</sub>/f<sub>2</sub> is?