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If a few construction work machines, like the ones used in drilling ground for sanitation purposes, are put into operation together and raise the noise level to 80.0 dB, what would be the sound intensity?
a) 2x10⁻⁵ W/m²
b) 6x10⁻⁴⁰ W/m²
c) 5x10⁷ W/m²
d) 1x10⁴ W/m²

Sagot :

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