Pick ANY 1 Given f = 60Hz, λ = 0.6cm OR λ = 0.6cm finding the wave speed wave speed (V) = Fλ V = 0.6 × 0.06 V = 0.3ms⁻¹

$$V = 0.36 \, \text{m/s}$$

The wave speed is $\boxed{\text{0.36 m/s}}$.

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10d ii)
Given:
Wavelength $\lambda = 20 \, \text{cm}$
Wave speed $V = 0.3 \, \text{m/s}$

Rearrange the formula to solve for $f$: $f = \frac{V}{\lambda}$.

$$f = \frac{0.3 \, \text{m/s}}{0.2 \, \text{m}}$$

$$f = 1.5 \, \text{Hz}$$

The frequency is $\boxed{\text{1.5 Hz}}$.