| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.39 |
| Score | 0% | 68% |
Generally, an atom has __________ negative electrons orbiting the nucleus as it does positive protons inside.
more |
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fewer |
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double the number of |
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equal numbers of |
An electron is a subatomic particle that orbits the nucleus of an atom. It carries a negative electric charge. Generally, an atom has the same number of negative electrons orbiting the nucleus as it does positive protons inside.
What kind of weather front is likely to create clouds and storms?
temperate front |
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cold front |
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warm front |
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stationary front |
A warm front is the boundary between warm and cool (or cold) air when the warm air is replacing the cold air. Warm air at the surface pushes above the cool air mass creating clouds and storms.
The Sun is a __________-type main-sequence star.
G |
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E |
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D |
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S |
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.
A subatomic particle found in the nucleus of an atom. It carries a positive electric charge. This desribes which of the following?
atom |
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electron |
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neutron |
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proton |
A proton is a subatomic particle found in the nucleus of an atom. It carries a positive electric charge.
A major difference between sound waves and light waves is which of the following?
a sound wave is much slower than a light wave |
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all of these are correct |
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a sound wave is mechanical while a light wave is electromagnetic |
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a sound wave cannot travel through a vacuum |
A vibrating object produces a sound wave that travels outwardly from the object through a medium (any liquid or solid matter). The vibration disturbs the particles in the surrounding medium, those particles disturb the particules next to them, and so on, as the sound propagates away from the vibration.