| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.28 |
| Score | 0% | 66% |
A subatomic particle found in the nucleus of an atom. It carries a positive electric charge. This desribes which of the following?
electron |
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neutron |
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proton |
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atom |
A proton is a subatomic particle found in the nucleus of an atom. It carries a positive electric charge.
Water has a refractive index of 1.33. Which of the following is true?
light is 1.33 times brighter in a vacuum than it is in water |
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light travels 1.33 times slower in a vacuum than it does in water |
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light is 1.33 times dimmer in a vacuum than it is in water |
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light travels 1.33 times faster in a vacuum than it does in water |
The speed of light varies based on the material that the waves are passing through. The refractive index of a material indicates how easily light travels through it compared to how easily light travels through a vacuum. For example, the refractive index of water is 1.33, meaning that light travels 1.33 times faster in a vacuum than it does in water.
Which of the following is the narrowest classification of life?
species |
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genus |
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domain |
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family |
The narrowest classification of life, species, contains organisms that are so similar that they can only reproduce with others of the same species.
As part of digestion, the liver produces bile which breaks down:
fat |
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sugars |
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protein |
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starches |
The liver produces bile which emulsifies (separates) fat.
Sound travels fastest through which of the following media?
air |
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water |
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vacuum |
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metal |
The speed of a sound wave will vary with the medium. Sound travels fastest through media that has particles that are very close together, like metal. Thus, it travels faster through water than through air and doesn't travel at all through a vacuum (there are no particles in empty space to vibrate).