Marcelo is facilitating the class with his normal voice. Student A, siting at 6 meters from Marcelo hears his voice with an intensity of 70dB A) How much is the Power of the sound Marcelo produces? B) Student B is sitting at 10 meters from Marcelo, but the students wants also to hear the class will an intensity of 70db, therefore the student decide to bring an Amplifier. What will be the gain of the amplifier to ensure that Student B, siting at 10 meters from Marcelo will hear also the class with an intensity of 70db? C) Student C is sitting in the front row at 1 meter from Marcelo. Student C wants also to hear the class with an intensity of 70dB, and therefore Student C decide to use earplugs. How much will be the intensity of the sound the earplug need to attenuate Marcelo’s sound to allow Student C to hear the class with and intensity of 70 dB?
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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5) Marcelo is facilitating the class with his normal voice. Student A, siting at 6 meters from Marcelo hears his voice with an intensity of 70dB
A) How much is the Power of the sound Marcelo produces?
B) Student B is sitting at 10 meters from Marcelo, but the students wants also to hear the class will an intensity of 70db, therefore the student decide to bring an Amplifier. What will be the gain of the amplifier to ensure that Student B, siting at 10 meters from Marcelo will hear also the class with an intensity of 70db?
C) Student C is sitting in the front row at 1 meter from Marcelo. Student C wants also to hear the class with an intensity of 70dB, and therefore Student C decide to use earplugs. How much will be the intensity of the sound the earplug need to attenuate Marcelo’s sound to allow Student C to hear the class with and intensity of 70 dB?
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