Physics - Error Question with Solution | TestHub

In a resonance-column experiment, successive resonance lengths are $l_1=30.7\mathrm{cm}$ and $l_2=63.2\mathrm{cm}$, using a tuning fork of frequency $512\mathrm{Hz}$. Each length reading has an uncertainty of $\pm 0.05\mathrm{cm}$. With $v=f\lambda$ and $\lambda =2(l_2-l_1)$, the maximum error in speed is: