| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.26 |
| Score | 0% | 65% |
The rate of vibration of sound is called:
frequency |
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volume |
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period |
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amplitude |
The rate of vibration of sound is called frequency and is measured in hertz (Hz). One hertz is one repetition per second and sounds with high frequency have a higher pitch than sounds with lower frequency. Humans can hear sounds in the range of 20 Hz to 20 kHz.
Molecules and atoms that are outputs from a chemical reaction are known as which of the following?
products |
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reactants |
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results |
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side effects |
During a chemical reaction molecules and atoms (reactants) are rearranged into new combinations that result in new kinds of atoms or molecules (products).
Plant cells may generate energy through which of the following?
all of these |
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aerobic respiration |
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photosynthesis |
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anaerobic respiration |
Some plant cells produce their own energy through photosynthesis which is the process by which sunlight, carbon dioxide, and water react to make sugar and oxygen. Animal cells cannot produce their own energy and, instead, generate energy when mitochondria consume outside sugar and oxygen through aerobic respiration.
During digestion, after proteins are broken down where does the undigested food go next?
stomach |
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esophagus |
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large intestine |
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small intestine |
Food is mixed with gastric acid and pepsin in the stomach to help break down protein.
In the metric system, what prefix represents 10-3?
milli |
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kilo |
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centi |
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mega |
In the metric system, milli is the prefix for 10-3.