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8J
Key Stage 3 Science
| Question | Answer |
|---|---|
| Light and sound are examples of what types of waves and state their speeds in air along with other things they can travel through | |
| Describe what happens to light when it is transmitted, reflected and absorbed describe also an opaque, translucent and transparent material | |
| State the law of reflection and describe the 2 different types of reflection | |
| Describe refraction and then state why and where refraction happens | Refraction is the bending of light rays at the interface or boundary as it goes from I medium to another. Refraction happens because light travels at different speeds in different medium |
| Explain the change in speed and direction of bending of light as it goes from a more dense material to a less dense material and from a less dense material to a more dense material | From a less dense material to a more dense material, light slows down as it refracts and the light bends towards the normal. From a more dense material to a less dense material, light speeds up as it refracts and bends away from the normal |
| Describe the focal length and focal point of a converging lens and list 3 instruments that use lenses | For a converging lens the point where the rays meet is called the focal point, the focal length is the distance between the centre of the lens and the focal point. Three instruments that use lenses are the camera ,microscope and telescope |
| State the function of the memory card, shutter, screen and aperture in a camera and state, which part of the eye or body works in a similar way to each | |
| State the names of the 2 types of specialised cells in the retina, where they are located and their functions | The the rods cell and the cone cells.The rod cells are found in the outer part of the retina while the cone cells are found in the centre of the retina.Rod cells detect very faint light and cone cells detect the different colours |
| State 2 sources of white light, and 2 ways white light can be split into its components and what are the different frequencies of white light seen as | |
| Why are objects seen to have different colours and explain why we see a book page as white but the book cover as being blue and a blazer as black |
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Davenant Foundation School
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