| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.82 |
| Score | 0% | 76% |
A major difference between sound waves and light waves is which of the following?
a sound wave is mechanical while a light wave is electromagnetic |
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a sound wave cannot travel through a vacuum |
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all of these are correct |
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a sound wave is much slower than a light wave |
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.
An endoskeleton (internal skeleton) is a charateristic of __________ animals, including humans.
sentient |
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spiny |
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arthropod |
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vertebrate |
An endoskeleton (internal skeleton) is a charateristic of vertebrate animals, including humans.
The heat from the Sun traveling to Earth is an example of which of the following?
radiation |
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convection |
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electricity |
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conduction |
Radiation occurs when electromagnetic waves transmit heat. An example is the heat from the Sun as it travels to Earth.
The rate of vibration of sound is called:
period |
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volume |
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frequency |
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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.
Within DNA, a variety of a particular gene is called a(n):
chromosome |
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allele |
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heterozygous |
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homozygous |
The gene is the base unit of inheritance and is contained within DNA. A gene may come in several varieties (alleles) and there are a pair of alleles for every gene. If the alleles are alike, a person is homozygous for that gene. If the alleles are different, heterozygous.