Place ticks (✓\checkmark✓) in the table to show the properties of sound waves and of gamma rays.
| Property | Sound waves | Gamma rays |
|---|---|---|
| longitudinal | ||
| transverse | ||
| travel in a vacuum | ||
| can cause ionization |
A scientist at a ground station uses a laser rangefinder to measure the distance to a weather satellite orbiting Earth. The laser emits a pulse of light towards a reflector on the satellite, and the pulse returns to the station.
The pulse takes a total round-trip time of 0.0056 s0.0056\text{ s}0.0056 s to travel to the satellite and back to the station. The speed of light is 3.0×108 m/s3.0 \times 10^8\text{ m/s}3.0×108 m/s.
Calculate the distance between the ground station and the satellite.
State one common use of X-rays.
State one harmful effect of X-rays.
198 exam-style questions on CIE IGCSE Physics Electromagnetic spectrum, covering Electromagnetic spectrum. Each one has a worked solution and a mark scheme showing where the marks go.