During a cricket game one fan is located directly behind wickets, 18.3 m from the batter and a second fan, is located in the centerfield bleachers, 127 m from the batter. Both fans observe the batter strike the ball at the same time (because the speed of light is about a million times faster than that of sound), but the fan behind home plate hears the sound first. a) What is the time difference between hearing the sound at the two locations? Use 345 m/s as the speed of sound. b) As the batter hits the ball at a speed of 43,556 m/s and a 220 Hz sound is emitted. If the ball moves in the direction of the first fan what frequency would she observe?
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.
During a cricket game one fan is located directly behind wickets, 18.3 m from the batter and a second fan, is located in the centerfield bleachers, 127 m from the batter. Both fans observe the batter strike the ball at the same time (because the speed of light is about a million times faster than that of sound), but the fan behind home plate hears the sound first.
a) What is the time difference between hearing the sound at the two locations? Use 345 m/s as the speed of sound.
b) As the batter hits the ball at a speed of 43,556 m/s and a 220 Hz sound is emitted. If the ball moves in the direction of the first fan what frequency would she observe?
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