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perut ke-4 72 cm
kalo jarak dari asal getaran
120-72 = 48 cm
X'S4 = 36 cm => XS4 = l - X'S4
= 120 - 36 = 84 cm
a. Xs4 = (2n+1) 1/4 A
84 = (2.3+1) 1/4 A
84 = 7/4 A
A. = 7/4 × 84 = 48 cm
b. Xp3 = n(1/2)A
= 2(1/2) A
= A
= 48 cm
nb. A = lamda