January 2019 1 15 Report
Sebuah sumber bunyi mempunyai taraf intensitas 20 dB. jika 40 buah sumber bunyi yang sama berbunyi secara serentak, taraf intensitas yang dihasilkan adalah..

a. 10 + 20log2
b. 20 + 20log2
c. 30 + 20log2
d. 20 + 2log20
e. 30 + 2log20

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