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| Pregunta | Respuesta |
| What type of wave is a sound wave? Longitudinal Electromagnetic Transverse | Sound waves are longitudinal waves. They cannot pass through a vacuum. |
| Which example proves light is faster than sound? We see ripples in water after hearing a splash We see lightning before hearing thunder We hear lightning before seeing thunder | Seeing lightning before hearing thunder shows us the light travels faster than sound. |
| Which of these can happen to light waves? Reflection and diffraction only Reflection and refraction only Reflection, refraction and diffraction | Light waves can be reflected and diffracted but also refracted. |
| What is the law of reflection? The angle of incidence is always greater than the angle of reflection The angle of entry equals the angle of reflection The angle of incidence equals the angle of reflection | The law of reflection states that the angle of incidence is always the same as the angle of reflection. |
| What is dispersion? The splitting of light into the colours of the rainbow When waves spread out after passing through a gap When waves change speed when they enter a new medium | Dispersion is the splitting of light into the colours of the rainbow. |
| Which colour of light is refracted the least? Red Green Violet | Red light is refracted the least. Refraction occurs when it enters a medium with a different density. |
| What type of wave is a light wave? Longitudinal Transverse Water | Light waves are examples of transverse waves. |
| How do we calculate refractive index? n = sin r ÷ sin i n = sin i ÷ sin r n = sin i × sin r | The refractive index is calculated as: n = sin i ÷ sin r. |
| In which does light travel the fastest? Glass Water Air | Light travels fastest in the least dense medium of air. |
| Through which medium does sound travel the fastest? Solid Liquid Gas | Sound travels fastest through solids because the particles are closest together. |
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