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Definition
| When we look at the sky, we see the light scattered by the atmosphere; most of this light is blue. |
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| The light at sunset travels through more atmosphere. Blue light gets scattered by the atmosphere more than red, so only the red gets through. |
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| Why water is greenish blue? |
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Definition
| Water absorbs red light more than any other color; greenish blue (cyan) results when red is subtracted from white light. |
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Definition
| Light changes speed on passing from one medium to another. |
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| Sunlight enters raindrops, reflects off the back side and emerges again. Dispersion spreads the colors so they emerge at different angles. |
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Term
| Which bends more when refracted, violet light or red light? |
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Term
| Which two great physicists invented a kind of telescope? |
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Definition
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Term
| What causes flourescence? |
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Definition
| Electrons in an atom become excited and then lose the energy. The energy is given to a photon that we see as flourescence. |
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Definition
| Movement of charge, usually an electron. The motion causes a change in the electric field, which induces a magnetic field and both alternate in the form of a light wave. |
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Term
| When white light shines on a red rose petal, what happens to the non-red colors? |
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Definition
| They are absorbed by the petal. |
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Term
| Why is black clothing hotter than white clothing when out in the sun? |
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Definition
| White fabric reflects most of the light that shines on it, while black absorbs most of the light, which makes it warmer. |
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