(a)[3]
Use the principle of superposition to explain how a stationary wave is formed.
(b)[3]
Describe an experiment to find the wavelength of sound in air using stationary waves. Include a diagram of the apparatus in your answer.
(c(i))[1]
On the $x$-axis of Fig. 6.1, show the positions of all the nodes and antinodes of the stationary wave. Label the nodes $N$ and the antinodes $A$.
(c(ii))[3]
The speed of sound in air is $340\,\text{m s}^{-1}$. Use Fig. 6.1 to find the frequency of the sound wave.