(a)[1]
Define the term velocity.
(b)
The speed $v$ of a sound wave in a gas with pressure $P$ and density $\rho$ is given by the equation $v = \sqrt{\frac{kP}{\rho}}$, where $k$ is a constant with no units. An experiment is carried out to find the value of $k$. The measurements are shown in Fig. 1.1.
(b(i))[2]
Use data from Fig. 1.1 to calculate $k$.
(b(ii))[3]
Use your answer in (b)(i) together with data from Fig. 1.1 to determine the value of $k$, with its absolute uncertainty, to an appropriate number of significant figures.