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Verified answer
Rumus intensitas bunyi : I = P/A = P/4πR²Jd intensitas berbanding terbalik dgn kuadrat dr jarak
I1 : I2 : 13 = 1/R1² : 1/R2² : 1/R3² = 1/4² : 1/9² : 1/12² = 1/16 : 1/81 : 1/144 = 81 : 16 : 9