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Two atmospheric sound sources A and B emit isotropically at constant power. The sound levels ? of their emissions are plotted in the figure versus the radial distance r from the sources. The vertical-axis scale is set by ?1 = 82.0 dB and ?2 = 68.0 dB. What are

(a) the ratio of the larger power to the smaller power and

(b) the difference in their sound levels at r = 9.60 m?

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