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Given P = 100 watts.

Reference sound intensity Po = 10^−12 W.

Reference sound intensity level LPo = 0 dB.

Get power level LP in dB when entering sound power P in watts.

Power level LP = 10×log (P / Po) dB = 10×log (100 / 10^−12)

= 140 decibels (dB).

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