| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.21 |
| Score | 0% | 64% |
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 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 |
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light travels 1.33 times slower 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.
What type of cloud is responsible for fog?
cumulonimbus |
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stratus |
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cumulus |
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cirrus |
Clouds are categorized based on their shape, size, and altitude. Stratus clouds are low-altitude clouds characterized by horizontal layering with a broad flat base. When stratus clouds occur on the ground the result is fog.
The energy posessed by a ball on the window ledge of a tall building is an example of what kind of energy?
kinetic |
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gravitational |
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potential |
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inherent |
Kinetic energy is the energy posessed by a moving object. Potential energy is stored energy in a stationary object based on its location, position, shape, or state.
Poor balance could indicate an issue with which part of the nervous system?
medulla |
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cerebrum |
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spinal cord |
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cerebellum |
The cerebellum is a large cluster of nerves at the base of the brain that's responsible for balance, movement, and muscle coordination.
Which of the following members of the food chain are most alike?
herbivores and autotrophs |
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producers and tertiary consumers |
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scavengers and decomposers |
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primary consumers and omnivores |
Like decomposers, scavengers also break down the dead bodies of plants and animals into simple nutrients. The difference is that scavengers operate on much larger refuse and dead animals (carrion). Decomposers then consume the much smaller particles left over by the scavengers.