Penjelasan:

1) Diketahui :

- s = 21 m

- t2 = 3 s

- n1 = 5

- t1 = 1 s

Ditanya :

- λ ?

Jawaban :

(:) Cari n2 ( banyak gelombang )

n2 = n1 / t1 . t2

n2 = 5 / 1 . 3

n2 = 15 gelombang

(:) Cari λ ( panjang gelombang )

λ = s / n2

λ = 21 / 15

λ = 1,4 m

2) a) A = 2 m

b) f = n / t

f = 2 / 8

f = 0,25 Hz

c) T = 1 / f

T = 1 / 0,25

T = 4 s

d) λ = s / n

λ = 3 / 1 / 4

λ = 12 m

e) v = λ . f

v = 12 . 0,25

v = 3 m/s

f) v = λ . f

v = λ . n / t

v = 12 . 2 / 1

v = 24 m/s

g) n = f . t

n = 0,25 . 60

n = 15 gelombang

h) t = n / f

t = 2,5 / 0,25

t = 10 s

i) s = λ . n

s = 12 . 1,5

s = 18 m

3) a) n = 2,5 gelombang

b) f = n / t

f = 2 / 0,5

f = 4 Hz

c) T = 1 / f

T = 1 / 4

T = 0,25 s

d) v = λ . f

v = s / n . f

v = 4 / 2 . 4

v = 8 m/s

e) v = λ . f

v = s / n . n / t

v = 4 / 2 . 2 / 1

v = 4 m/s

4) f = n / t

f = 1 / 2

f = 0,5 Hz

T = 1 / f

T = 1 / 0,5

T = 2 s

5) a) A = 12 cm

b) T = t / n

T = 2 / 1,5

T = 1,33 s

c) n = t / T

n = 1 / 1,33

n = 0,75 gelombang

d) n = t / T

n = 60 / 1,33

n = 45 gelombang

e) t = n . T

t = 1.200 . 1.33

t = 1.600 s

Semoga Membantu :)