wo trains are in a train yard. One train is stationary (as are you) while the other train is moving away from you with a speed of 30 km/h. Each train has a 400-Hz whistle. The trains blow their whistles at the same time. (a) What frequency of sound will you hear from each train? (b) Will there be a beat frequency? If so, what is it? (Assume that the speed of sound is 340 m/s in this case
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.
Two trains are in a train yard. One train is
stationary (as are you) while the other train is
moving away from you with a speed of 30 km/h.
Each train has a 400-Hz whistle. The trains
blow their whistles at the same time.
(a) What frequency of sound will you hear from
each train?
(b) Will there be a beat frequency? If so, what
is it? (Assume that the speed of sound is
340 m/s in this case.)
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