A fireworks rocket explodes at a height of 1000 m above the ground. An observer on the ground directly below the explosion experiences an average sound intensity of 7.00 × 10-2 W/m2 for 0.200 s. (a) What is the total amount of energy transferred away from the explosion by the sound? (b) What is the intensity level (sound level) in decibels heard by the observer? For a second observer (watching from home) located 5.25 km horizontally away from the first observer what are (c) the intensity
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 fireworks rocket explodes at a height of 1000 m above the ground. An observer on the ground directly below the explosion experiences an average sound intensity of 7.00 × 10-2 W/m2 for 0.200 s. (a) What is the total amount of energy transferred away from the explosion by the sound? (b) What is the intensity level (sound level) in decibels heard by the observer?
For a second observer (watching from home) located 5.25 km horizontally away from the first observer what are (c) the intensity and (d) the intensity level at the location of the second observer? Include a diagram of the situation.
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