(a)[2]
Describe the way stationary waves are formed.
(b)
The apparatus arrangement used to find the wavelength of a sound wave is shown in Fig. 8.1. The loudspeaker sends out sound of a single frequency. The microphone is linked to a cathode-ray oscilloscope (c.r.o.). The waveform produced on the c.r.o. for one microphone position is shown in Fig. 8.2.
(b(i))[2]
The c.r.o. time-base setting is $0.20\,\text{ms cm}^{-1}$. Use Fig. 8.2 to demonstrate that the sound frequency is approximately $1300\,\text{Hz}$.
(b(ii))[2]
Explain how the apparatus can be used to determine the wavelength of the sound.
(b(iii))[2]
The wavelength of the sound wave is $0.26\,\text{m}$. Calculate the speed of sound in this experiment.