Taraf intensitas bunyi satu buah sepeda motor adalah 50db, jika taraf intensitas bunyi yang terdengar adalah 90db. maka ada berapakah jumlah sepeda motor yang dibunyikan secara bersamaan?

Taraf intensitas bunyi satu buah sepeda motor adalah 50db, jika taraf intensitas bunyi yang terdengar adalah 90db. maka ada berapakah jumlah sepeda motor yang dibunyikan secara bersamaan?
a. 10 buah
b. 1000 buah
c. 10000 buah
d. 5 buah
e. 100 buah

Jawaban yang benar adalah c. 10.000 buah

Taraf intensitas bunyi merupakan logaritma dari perbandingan intensitas bunyi dengan intensitas ambang.
Untuk n sumber bunyi yang sama maka besarnya taraf intensitas bunyi dirumuskan:
TIn = TI1 + 10 log n
dimana:
TIn = taraf intensitas bunyi dari n sumber bunyi yang sama (dB)
TI1 = taraf intensitas bunyi dari sebuah sumber bunyi (dB)
n = banyak sumber bunyi yang sama

Diketahui:
T1 = 50 dB
TIn = 90 dB
Ditanya:
n = ….
Jawab:
TIn = TI1 + 10 log n
90 = 50 + 10 log n
90 – 50 = 10 log n
40 = 10 log n
40/10 = log n
log n = 4
n = 10⁴
n = 10.000 buah

Jadi, jumlah sepeda motor yang dibunyikan secara bersamaan ada 10.000 buah
Oleh karena itu, jawaban yang benar adalah c

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