1 50 m/s, speeding up 2 50 m/s, steady speed 3 + 50 m/s, slowing down 4* 50 m/s, speeding up *5 50 m/s, steady speed * 6 50 m/s, slowing down *7 At rest FIGURE Q15.18
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 are standing at x = 0 m, listening to seven identical sound sources described by as shown. At t = 0 s, all seven are at x = 343 m and moving as shown below. The sound from all seven will reach your ear at t = 1 s. Rank in order, from highest to lowest, the seven frequencies f1 to f7 that you hear at t = 1 s. Explain.
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