1a. A speaker is playing music at 4.3 W. What is the intensity of the music if the speaker is 0.5 m away from you? 1b. What is the loudness of this speaker? Speaker A is playing a sound with double the intensity of Speaker B. How much louder is Speaker A than Speaker B? Speaker A is playing a sound with a quarter of the amplitude of Speaker B. How much louder is Speaker A than Speaker B? What is the impedance of a wave with a speed of 243m/s and a density of 3.2 kg/m3. What is the ratio of impedance when Z1 = 3.2 x 103 and Z2 = 1.45 x 102 ? 7a. The ratio of impedance of two substances is 7. What percentage of intensity is transmitted at the boundary? 7b. What percentage of intensity is reflected?
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.
1a. A speaker is playing music at 4.3 W. What is the intensity of the music if the speaker is 0.5 m away from you?
1b. What is the loudness of this speaker?
- Speaker A is playing a sound with double the intensity of Speaker B. How much louder is Speaker A than Speaker B?
- Speaker A is playing a sound with a quarter of the amplitude of Speaker B. How much louder is Speaker A than Speaker B?
- What is the impedance of a wave with a speed of 243m/s and a density of 3.2 kg/m3.
- What is the ratio of impedance when Z1 = 3.2 x 103 and Z2 = 1.45 x 102 ?
7a. The ratio of impedance of two substances is 7. What percentage of intensity is transmitted at the boundary?
7b. What percentage of intensity is reflected?
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