The decibel (dB) is a logarithmic unit of measurement that messures the aim of sizeable.
Measurement of the level by extravagance
L [dB] = 10log of J/J0 (J = persuasiveness) (J0 = Sm all toldest level Of Hearing)
J0 = 10ˉ¹² w/m² = smallest level of hearing
L [dB] = (Level of pass away in dB)
J = Intensity of Sound W/m2
Jo = Intensity of sound on the lowest scale of hearing. (1000Hz)
All instruments for messuring the military capability of sound in topographic point argon working with dB
If we come int have information on the sound intensity we can calculate it with the soundpressure.
Measurement of the level by Pressure
L[dB] = 10log of p²/po² = 20log of p/po
L[dB] = Level Of Sound In dB
P = Soundpressure in Pascals
P0= Soundpressure on the lowest level of hearing
If we ar talking about the same spot in space the sound level in dB is going to be the same regardless of which of this 2 ways is used to calculate.
How sound is created:
when a change of position of particles of a elastical eviroment happens
by force.
Soundwaves:
soundwaves argon created when a hard object occilates,
Hz messures the number of occilations in seconds
the number of occilations needs to be between 20 and 20000 (Hz) to be heard by the human hear.
below 20Hz = Infra-sound
Above 20000Hz = basal sound
soundwaves can be spherical or flat
spherical soundwaves are created by dot-shaped sound sources
their main carachteristic, is that they spread in all directions.
when a spherical soundwave moves further away from its source tardily becomes a flat wave
with normal atmosferic pressure and temperature of 20 degrees the induce of soundwaves is 343m/s c = 343 m/s
speed of soundwaves is increased with temperature
: messures the move of the particles (xi)
(xi = v/omega)
v (speed of particles)
omega...If you want to get a spacious essay, order it on our website: Ordercustompaper.com
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