Jawab isi penyelesaianya

17. l1 = 100 cm; l2 = 36 cm
T = 2π √l/g
T1/T2 = √l1/l2
T1/T2 = √100/36
T1/T2 = 10/6 = 1,67 (tidak ada jawaban)

** kalo terpaksa harus memilih ya T2/T1 = 6/10 = 0,6 (B)

18. l1 = 40 cm; l2 = 160 cm
T1/T2 = √l1/l2
T1/T2 = √40/160
T1/T2 = √1/4
T1/T2 = 1/2
T2 = 2T1 (B)

19. y = 0,2 sin 8πx cos 2πtdicari panjang gelombang (λ)?

rumus umum y = A sin kx cos wt dengan k = 2π/λ

k = 8π
8π = 2π/λ
λ = 2π/8π = 0,25 m = 25 cm (B)

20. y = 0,2 sin 8πx cos 2πt
Rumus umum sama seperti no 19 dengan w = 2πf

w = 2π
2π = 2πf
f = 1 Hz (A)