An observer stands on a pier and watches waves rolling in. The observer notices that 12 complete wavelengths pass a pillar in 20 s. What is the frequency of this wave?
0.60 Hz0.60\text{ Hz}0.60 Hz
1.67 Hz1.67\text{ Hz}1.67 Hz
8.0 Hz8.0\text{ Hz}8.0 Hz
240 Hz240\text{ Hz}240 Hz
237 exam-style questions on CIE IGCSE Physics General properties of waves, covering General properties of waves. Each one has a worked solution and a mark scheme showing where the marks go.