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There is a machine in a room. You measure noise level in a room to be 7 3 dB , when the machine is operating,

There is a machine in a room. You measure noise level in a room to be

73

,

when the machine is operating, and

68.6

dB when the machine is turned off. Calculate the sound pressure level produced by the machine. Give the answer with one decimal place accuracy.

(

)

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