A student stands 85 m from a large wall and claps.
She claps at a steady rate so that each clap is made at the same moment as the echo of the previous clap is heard.
The time for 20 intervals between claps is 10 s.
What is the speed of sound in air calculated from these results?
85 m/s85\ \text{m/s}85 m/s
170 m/s170\ \text{m/s}170 m/s
340 m/s340\ \text{m/s}340 m/s
680 m/s680\ \text{m/s}680 m/s
52 exam-style questions on OCR GCSE Physics 5.1 Wave behaviour, covering 5.1.1 Describing wave motion, 5.1.2 Wavelength and frequency, 5.1.3 Wave speed, frequency and wavelength, 5.1.4 Wave speed problems, 5.1.5 Transverse and longitudinal waves, 5.1.6 Sound waves crossing between media, 5.1.7 Reflection, transmission and absorption at interfaces, 5.1.8 Sound waves and vibrations in solids, 5.1.9 Frequency range and human hearing, 5.1.10 Modelling waves with water ripples and sound, and 5.1.11 Evidence that the wave travels, not the medium. Each one has a worked solution and a mark scheme showing where the marks go.