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3 bukit 2 lembah = 2,5 λ
1 λ = 5 m
T = 3s
ditanyakan:
λ? v?
jawab:
STEP 1: mencari panjang gelombang (λ)
1λ = 5 m, maka:
2,5 λ = 2,5 x 5 = 12,5 m
STEP 2: mencari cepat rambat gelombang (v)
v = λ/T
v = 12,5 / 3
v = 4,167 m/s
2. diketahui:
l = 8 m
t = 4 s
2 bukit 2 lembah = 2 gelombang
ditanyakan: λ? T? f? v?
jawab:
(a)
2 λ = 8 m
λ = 8/2 = 4 m
(b)
n = 2 gelombang
t = 4 s
T = t/n = 4/2 = 2 s
(c)
f = 1/T = 1/2 = 0,5 Hz
(d)
v = λ x f
v = 4 x 0,5 = 8 m/s
3. diketahui:
s = 6 m
t = 2 s
3 regangan 2 rapatan = 2,5 λ
ditanyakan: T? v?
jawab:
(a)
T = t/n
T = 2 / 2,5
T = 0,8 s
(b)
v = λ/T
2,5λ = 6 m
λ = 6/2,5 = 2,4 m
v = 2,4/0,8 = 3 m/s
4. diketahui:
v = 1500 m/s
t = 3 s
ditanyakan: h?
jawab:
h = v x t/2
h = (1500 x 3)/2
h = 2250 m
5.
a. mengukur kedalaman laut (SONAR), laser, USG (deteksi janin)
b. contoh resonansi: pipa resonansi pada seruling, tabung resonansi pada gitar