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Sound Level Decibel
By the number of decibels is the noise level below that of his 2?
Two sounds were measured intensities I1 = 100 W / m 2 and I2 = 200 W/m2. As the number of decibels the noise level is lower than the 2?
dB = 10 log (10) [I / Io] where I = intensity source (W / M ^ 2) = Io the intensity of the human ear = 10 ^ -12 W / m ^ 2 dB his ============= a DB1 = 10 log (10) [I1 / Io] = 10 {log (10) [100] - (-12) register (10)] {DB1 = 10 2 log (10) [10] + 12 log (10) (10)] = 10 DB1 {2} = 12 120 --- 2 ------- Her -------- -------------- DB2 = 10 {log (10) [200] + 12 log (10) (10)] = {10 db2 log (10 ) [100] + log (10) [2] + 12 log (10) (10)] = 10 {2 DB2 + Log (10) [2] + 12] = 10 {14 DB2 + 0.301] = 143 ============ DB1 - db2 = - 23 dB of noise for a child who is 23 years sound 2
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