A train travelling at a speed of 40kph approaching your location while an airplane flying 1km above your location produces and SPL meter reading of 85dB. Calculate the sound power produced by the airplane. Determine the sound intensity of the train 2 hours before it reach your location when it produces a sound power level of 76dB. Find the total sound power level of the combined train and the airplane. Calculate the total sound level of the two different sound sources.
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.
A train travelling at a speed of 40kph approaching your location while an airplane flying 1km above your location produces and SPL meter reading of 85dB.
- Calculate the sound power produced by the airplane.
- Determine the sound intensity of the train 2 hours before it reach your location when it produces a sound power level of 76dB.
- Find the total sound power level of the combined train and the airplane.
- Calculate the total sound level of the two different sound sources.
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