# Question

A 1000-Hz tone from a loudspeaker has an intensity level of 100 dB at a distance of 2.5 m. If the speaker is assumed to be a point source, how far from the speaker will the sound have intensity levels

(a) Of 60 dB and

(b) Barely high enough to be heard?

(a) Of 60 dB and

(b) Barely high enough to be heard?

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