Page 69 - Materi Gelombang Bunyi Kelas XI
P. 69
Jika = 30 , = 80 , = 60 , maka :
2
= − 10 log ( )
2
60 = 80 − 10 log ( )
30
2
10 log ( ) = 80 − 60
30
2
10 log ( ) = 20
30
2
log ( ) = 2
30
2
2
log ( ) = log 10
30
2
2
( ) = 10
30
= √10
2
30
= 10 . 30 = 300 (terbukti)
b. Pengecekan satuan
2
= − 10 log ( )
2
= − ( )
= −
= (terbukti)
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