(a(i))[1]
Estimate the mass, in g, of a new pencil.
(a(ii))[1]
Estimate the wavelength of ultraviolet radiation.
(b(i))[1]
The period $T$ for the oscillations of a mass $m$ attached to a spring is given by $T = 2\pi\sqrt{\frac{m}{k}}$, where $k$ is the spring constant of the spring. The manufacturer states that the spring has a spring constant of $25\,\text{N m}^{-1} \pm 8\%$. A mass of $200 \times 10^{-3}\,\text{kg} \pm 4 \times 10^{-3}\,\text{kg}$ is hung from the end of the spring and then set into oscillation. Calculate the period $T$ of the oscillations.
(b(ii))[3]
Find $T$, together with its absolute uncertainty, and present it to an appropriate number of significant figures.