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A sound point source, situated 2.5 m above a brick floor, is emitting sound at 5...

A sound point source, situated 2.5 m above a brick floor, is emitting sound at 5 ✕ 10−5 watts.

(a) Find the sound intensity level (in dB) due to that source at a listening point 3.9 m above the floor and 17 m away. (Assume that 17 m is the horizontal distance between the sound point source and the listening point. Do not take reflection from the floor into account.)

=? dB

(b) Find the sound intensity level (in dB) at that point when the reflection from the floor is taken into account. (Assume 100% reflection.)

=? dB

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