Intensely Loud Question~H/w check

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B would be at I=I_0.In summary, at a distance twice as far away, the intensity of the wave would be 1.25mw/cm and the dB level of the wave's loudness would be -6.02 or 6.02 depending on the reference point.
  • #1
SwAnK
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at certain point the intensity of the wave is 5mw/cm. How intense would it be at a distance twice as far away. and find the dB level of the waves loudness according to the first.

For the intensity since it is twice as far away i found out that it is 1/4 as intense so i got an intensity of 1.25mw/cm.
For dB I used the 10log*I2/I1, and got -6.02, or 6.02 depending on how you look at it. Do these answers sound right?? thanx
 
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  • #2
Intensity goes as 1/r2, so the first part is right. If you're looking for the difference in decibel level, the second part looks right as well. If you're looking for absolute decibel levels, you need to consider it relative to the standard:

[tex]I_0=10^{-12}~W/m^2[/tex]
 
  • #3


Yes, your calculations and answers seem to be correct. When calculating intensity, the inverse square law states that the intensity decreases by a factor of 1/4 when the distance is doubled. And for dB, the formula you used is correct as well. The negative sign indicates that the sound intensity has decreased while the positive value indicates the increase in the loudness level. Keep up the good work!
 

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