The speed of light in air is known to be 3.0 × 108 m/s.
Outline how you would use a refraction experiment to deduce the speed of light in a rectangular plastic block. You may draw a diagram if it helps to clarify your answer.
An underwater volcanic eruption occurs under the ocean.
Waves on the surface of the water from the eruption have a wavelength of 150 m and travel at a speed of 30 m/s.
Calculate the frequency of these surface water waves.
The sound wave from the eruption travels through the ocean water at 1.5 × 103 m/s.
The marine research station detecting these signals is located on the coast, at a distance of 1.8 × 104 m from the eruption.
Calculate how much warning of the arrival of the surface water waves at the station is given by the detection of the underwater sound wave.
216 exam-style questions on CIE IGCSE Physics 3.2 Light, covering 3.2.1a Reflection of light, 3.2.1b Images in a plane mirror, 3.2.2 Refraction of light, 3.2.2a Refraction of light, 3.2.2b Total internal reflection, 3.2.2c Refractive index and critical angle, 3.2.2d Optical fibres, 3.2.3a Converging and diverging lenses, 3.2.3b Ray diagrams and the nature of images, 3.2.3c Virtual images and the magnifying glass, 3.2.3d Correcting long-sightedness and short-sightedness, and 3.2.4 Dispersion of light. Each one has a worked solution and a mark scheme showing where the marks go.