Complete the table below to show the properties of ultrasound waves and of radio waves by indicating which properties apply to each wave type with a tick (✓\checkmark✓).
| Property | Ultrasound waves | Radio waves |
|---|---|---|
| longitudinal | ||
| transverse | ||
| electromagnetic | ||
| travel in a vacuum |
A research vessel uses a sonar system to measure the depth of the seabed. A transmitter on the vessel sends a pulse of ultrasound down through the water to the ocean floor, where it is reflected back to a receiver on the vessel. The pulse takes a total time of 3.6 s3.6\text{ s}3.6 s to travel from the transmitter to the seabed and back to the receiver. The speed of sound in seawater is 1500 m/s1500\text{ m/s}1500 m/s.
Calculate the depth of the seabed.
(i) State one common use of X-rays. (ii) State one harmful effect of X-rays on human health.
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.