| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.00 |
| Score | 0% | 60% |
Which of the following is not a characteristic of the Sun?
is composed of hydrogen and helium |
|
makes up over 99% of the mass of the solar system |
|
is a yellow dwarf star |
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formed 2.6 billion years ago |
The Sun is a G-type main-sequence star (G2V) but is informally known as a yellow dwarf star. Composed of 73% hydrogen and 25% helium, the hot plasma that makes up the Sun reaches 9,900°F (5,505°C) at the surface. It formed approximately 4.6 billion years ago and makes up 99.86% of the mass in the solar system.
In the metric system, what prefix represents 10-3?
milli |
|
centi |
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mega |
|
kilo |
In the metric system, milli is the prefix for 10-3.
Which of the following is not true of light waves?
are mechanical waves |
|
are electromagnetic waves |
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can travel through a vacuum |
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travel faster than sound waves |
Unlike mechanical sound waves that require a physical medium for propagation, light waves are electromagnetic and can travel through empty space. Light waves are also much faster, travelling at 186,000 m/s vs. 343 m/s for sound waves.
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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inherent |
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gravitational |
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potential |
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.
Which of the following is not part of the carbon cycle?
precipitation |
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photosynthesis |
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decomposition |
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respiration |
The carbon cycle represents the ciruit of carbon through Earth's ecosystem. Carbon dioxide (CO2) in the atmosphere is absorbed by plants through photosynthesis. Plants then die and release carbon back into the atmosphere during decomposition or are eaten by animals who breathe (respiration) the carbon into the atmosphere they exhale and produce waste which also releases carbon as it decays.