A girl is sitting near the open window of a train that is moving at a velocity of 10.00 m/s to the east.The girl’s uncle stands near the tracks and watches the train move away.The locomotive whistle emits sound at frequency 500.0 Hz. The air is still. (a) What frequency does the uncle hear? (b) What frequency does the girl hear? A wind begins to blow from the east at 10.00 m/s. (c) What frequency does the uncle now hear? (d) What frequency does the girl now hear?
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 girl is sitting near the open window of a
train that is moving at a velocity of 10.00 m/s to the east.The girl’s
uncle stands near the tracks and watches the train move away.The locomotive whistle emits sound at frequency 500.0 Hz. The air is
still. (a) What frequency does the uncle hear? (b) What frequency
does the girl hear? A wind begins to blow from the east at 10.00
m/s. (c) What frequency does the uncle now hear? (d) What frequency
does the girl now hear?
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