Short Answer
15.1 The Electromagnetic Spectrum
Describe one way in which heat waves—infrared radiation—are different from sound waves.
- Sound waves are transverse waves, whereas heat waves—infrared radiation—are longitudinal waves.
- Sound waves have shorter wavelengths than heat waves.
- Sound waves require a medium, whereas heat waves—infrared radiation—do not.
- Sound waves have higher frequencies than heat waves.
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They are perpendicular to and out of phase with each other.
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They are perpendicular to and in phase with each other.
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They are parallel to and out of phase with each other.
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They are parallel to and in phase with each other.
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Overexposure to X-rays can cause HIV, though normal levels of X-rays can be used for sterilizing needles.
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Overexposure to X-rays can cause cancer, though in limited doses X-rays can be used for imaging internal body parts.
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Overexposure to X-rays causes diabetes, though normal levels of X-rays can be used for imaging internal body parts.
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Overexposure to X-rays causes cancer, though normal levels of X-rays can be used for reducing cholesterol in the blood.
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Sunlight is converted into chemical energy by plants; this energy is released when we digest food.
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Sunlight is converted into chemical energy by animals; this energy is released when we digest food.
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Sunlight is converted into chemical energy by fish; this energy is released when we digest food.
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Sunlight is converted into chemical energy by humans; this energy is released when we digest food.
15.2 The Behavior of Electromagnetic Radiation
Describe what happens to the path of light when the light slows down as it passes from one medium to another?
- The path of the light remains the same.
- The path of the light becomes circular.
- The path of the light becomes curved.
- The path of the light changes.
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The reflected light is polarized in the vertical direction.
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The reflected light is polarized in the horizontal direction.
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The reflected light has less intensity than the incident light.
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The reflected light has triple the intensity of the incident light.
How many lumens are radiated from a candle which has an illuminance of 3.98 lx at a distance of 2.00 m?
- 400 lm
- 100 lm
- 50 lm
- 200 lm
Saturn is 1.43×1012 m from the Sun. How many minutes does it take the Sun’s light to reach Saturn?
- 7.94 × 109 minutes
- 3.4 × 104 minutes
- 3.4 × 10–6 minutes
- 79.4 minutes