A car of length L = 26 m is moving through the stationary air with a constant velocity V, see the picture below. At the middle of the car there is a source of sound S, which emits signals in all directions, there are also two sound detectors DL and DR at the car's edges. Which of the detectors will receive the signal earlier? left-edge detector S DL What is the speed of the car if one detector receives signals by 4 msec earlier than the other one? The air temperature is 18°C. The speed of the car, V = 342.25413 x Units m/s DR Now the car is stationary but there is a 18-m/s wind blowing towards the car, as shown below. Which of the detectors will receive the sound signal earlier? left-edge detector S D₁ Units ms DR wind What is the time difference in the signal detection between the left and right detectors? The time difference, At =
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.
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