A train that has a 150 Hz horn is moving at 35 m/s. What frequency would a stationary observer on ground hear as the train approaches her? After the train passes her, what frequency would she hear? The speed of sound in still air is 340 m/s.
Properties of sound
A sound wave is a mechanical wave (or mechanical vibration) that transit through media such as gas (air), liquid (water), and solid (wood).
Quality Of Sound
A sound or a sound wave is defined as the energy produced due to the vibrations of particles in a medium. When any medium produces a disturbance or vibrations, it causes a movement in the air particles which produces sound waves. Molecules in the air vibrate about a certain average position and create compressions and rarefactions. This is called pitch which is defined as the frequency of sound. The frequency is defined as the number of oscillations in pressure per second.
Categories of Sound Wave
People perceive sound in different ways, like a medico student takes sound as vibration produced by objects reaching the human eardrum. A physicist perceives sound as vibration produced by an object, which produces disturbances in nearby air molecules that travel further. Both of them describe it as vibration generated by an object, the difference is one talks about how it is received and other deals with how it travels and propagates across various mediums.
A train that has a 150 Hz horn is moving at 35 m/s. What frequency would a stationary observer on ground hear as the train approaches her? After the train passes her, what frequency would she hear? The speed of sound in still air is 340 m/s.
- Approaching 167 Hz, receding 136 Hz
- Approaching 150 Hz, receding 136 Hz
- Approaching 167 Hz, receding 150 Hz
- Approaching 136 Hz, receding 167 Hz.
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