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Waves & Optics Formula

What is Wave Speed on a String?

The speed of transverse waves on a string depends on the string's tension and its linear mass density.

Formula: v = \sqrt{\frac{T}{\mu}}

Plain-English Meaning

The speed of transverse waves on a string depends on the string's tension and its linear mass density.

If a waves question feels messy, sketch the geometry or phase relationship first, then return to the algebra.

Deeper Explanation

The speed of transverse waves on a string depends on the string's tension and its linear mass density.

Worked Example

Problem: A 0.8 m string has μ = 0.005 kg/m and T = 80 N. Find wave speed and fundamental frequency.

  • v = √(T/μ) = √(80/0.005) = √16000 ≈ 126.5 m/s
  • f₁ = v/(2L) = 126.5/(2×0.8) = 79.1 Hz

Result: v ≈ 126.5 m/s, f₁ ≈ 79.1 Hz

At A Glance

Category: Waves & Optics

Levels covered:

Best use: Start with the formula meaning, then move to the worked example and quiz so the equation turns into a tool instead of a memorised line.