| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.99 |
| Score | 0% | 60% |
Water has a refractive index of 1.33. Which of the following is true?
light travels 1.33 times faster in a vacuum than it does in water |
|
light is 1.33 times dimmer in a vacuum than it is in water |
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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 |
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?
cirrus |
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cumulus |
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stratus |
|
cumulonimbus |
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.
Which of the following temperatures is least like the others?
0K |
|
absolute zero |
|
-273°C |
|
32°F |
Absolute zero is the coldest possible temperature in the universe. In the Kelvin scale, absolute zero is 0K and in the Celsius scale it is -273°C.
In the classification of life, which of the following is not a domain?
animalia |
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archaea |
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eukaryota |
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bacteria |
The broadest classification of life splits all organisms into three groups called domains. The three domains of life are bacteria, archaea and eukaryota.
Changes to an object's speed or direction of motion are caused by which of the following?
power |
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kinetic energy |
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a force |
|
work |
Force is applied to change an object's speed or direction of motion.