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ditanya n?
penyelesaian : v= lamda . f
12= lamda . 4
lamda= 3
lamda = s/n
3= 18/n
n= 18/3
= 6 gelombang
12 = lamda. 4
lamda = 3
n. lamda = 18
n. 3 = 18
n = 6
jadi banyaknya gelombang = 6