- #1
Daniel2244
- 125
- 5
I measure sound (dB) from a speaker at 0cm and 100cm using a diaphragm microphone.
0cm-100dB, 100cm-30dB
diaphragm microphone cinsists of a diaphram, coil and a permanent magnet. the coil is attached to the diaphragm, when a sound wave hits the diaphragm it causes to move back and forth which also causes the coil to move back and forth. This coild moved along a pernmanent maget which produced a magnetic flied, as the coil cuts the magnetic field a current is induced which travels to an amplifier.
So at 0cm the sound intensisty (100dB) is larger than the sound in tensity at 100cm (30dB) away from the speaker becuase the sound waves have less distance to travel therefore losing less energy? Additionally, becuase the sound is larger it causes the diaphragm to fluctuate faster, moving the coil through the magnetic field more which inducing a larger current than it would at 100cm away? (Not sure if my thinking is correct :/)
0cm-100dB, 100cm-30dB
diaphragm microphone cinsists of a diaphram, coil and a permanent magnet. the coil is attached to the diaphragm, when a sound wave hits the diaphragm it causes to move back and forth which also causes the coil to move back and forth. This coild moved along a pernmanent maget which produced a magnetic flied, as the coil cuts the magnetic field a current is induced which travels to an amplifier.
So at 0cm the sound intensisty (100dB) is larger than the sound in tensity at 100cm (30dB) away from the speaker becuase the sound waves have less distance to travel therefore losing less energy? Additionally, becuase the sound is larger it causes the diaphragm to fluctuate faster, moving the coil through the magnetic field more which inducing a larger current than it would at 100cm away? (Not sure if my thinking is correct :/)