barisan bil 1/4 akar 2,1/2,

Rasio (r)
r = U2 : U1
r = ½ : (¼)√2
r = ½ : (√2)/4
r = ½ × 4/(√2)
r = 4/(2√2)
r = 2/(√2)

r = 2/(√2) × (√2) / (√2)
r = (2√2) / 2
r = √2

Opsi C

Semoga berguna +_+