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T ~ √l
T₁ : T₂ = √l₁ : √l₂
T₁² : T₂² = l₁ : l₂
2² : T₂² = l₁ : 4l₁
4 : T₂² = 1 : 4
T₂² = 16
T₂ = 4
= 4s