You stand on a platform at a train station and listen to a train approaching the station at a constant velocity. while the train approaches, but before it arrives what do you hear? a) The intensity and the frequency of the sound both increasing b) The intensity and the frequency of the sound both decreasing c) The intensity increasing and the frequency decreasing d) The intensity decreasing and the frequency increasing. e) The intensity increasing and the frequency remaining the same f) Then intensity decreasing and the frequency remaining the same
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.
You stand on a platform at a train station and listen to a train approaching the station at a constant velocity. while the train approaches, but before it arrives what do you hear?
a) The intensity and the frequency of the sound both increasing
b) The intensity and the frequency of the sound both decreasing
c) The intensity increasing and the frequency decreasing
d) The intensity decreasing and the frequency increasing.
e) The intensity increasing and the frequency remaining the same
f) Then intensity decreasing and the frequency remaining the same
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