Required practical: Investigate properties of waves (ripple tank or waves on a string)

Aim

To measure wave speed using v = fλ by finding wavelength and frequency from a wave source.

Method (step-by-step)

1. Generate waves in a ripple tank; freeze strobe or video to measure λ across several crests.
2. Count frequency from motor frequency or measure time for N waves.
3. Repeat for different depths or tensions; calculate v each time.

Equipment

• Ripple tank or Slinky
• metre ruler
• strobe optional

Variables

• Independent: Depth of water / tension / frequency setting.
• Dependent: Wave speed (m s⁻¹).
• Control: Same method of measuring λ; same equipment

Results & analysis

Use multiple λ measurements along tank to reduce error; f from motor dial vs timed oscillations.

Graphs & interpretation

If v = fλ holds, product checks; plot f vs 1/λ may be linear depending on setup.

Exam-style question prompts

• How improve measurement of wavelength?

Exam tips

• SI units m, Hz, m s⁻¹
• Transverse vs longitudinal examples

Related topic revision

• Wave properties
• Wave speed equation