Does the Noise Level increase when two objects of the same decibel are together or does it stay the same?

Question

Thanks

Answer 1

Schmiso is correct.

Since you already have the mathematical explanation, here is an easy to use tool:

http://www.insulation.com.au/calculators...

Try it...type in two levels that are the same. Your answer will be 3 dB higher than the original level.

Answer 2

It increases by 3dB.

Explanation:

The sound intensities add up. So the sound intensity and the sound intensity level of two objects is greater than that of one .

Let I be the sound intensity of one object. Then its sound intensity level is given by:

L = 10∙log₁₀(I/I₀) dB  with I₀=10⁻¹²W/m²

The sound intensity of two objects of same intensity is:

L' = 10∙log₁₀(2∙I/I₀) dB

= 10∙log₁₀(I/I₀) dB + 10∙log₁₀(2) dB

= L + 3dB