Exam-style question
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Which factor increases the bandwidth of a transmission medium?.
- A.Higher attenuation.
- B.Lower impedance.
- C.Higher capacitance.
- D.Shorter cable length.
Model answer
What a good answer should say
- Lower impedance.
Explanation
Why this works
Formula: Bandwidth ∝ 1/√(L·C). Substitution: L = 1 μH, C = 1 nF.
Working: 1/√(1×10⁻⁶ × 1×10⁻⁹) = 1/√(1×10⁻¹⁵) = 1/1×10⁻⁷.5 ≈ 3.16×10⁷ Hz. Answer: 3.16×10⁷ Hz.
Units/conclusion: Hz. Lower impedance (lower L and C) allows higher bandwidth, reducing signal loss.
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