Which of the following is a good example of a physical entity that is a hazard to public health?
A) In much of the United States, mosquitoes are known to transmit West Nile virus to people.
B) The use of condoms is known to reduce the risk of most sexually transmitted diseases.
C) An earthquake kills more than 200,000 people in Haiti and destroys countless homes, roads and buildings.
D) Levels of mercury in some lakes result in dangerous levels of mercury found in fish sold to consumers.
C
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If the Earth's average surface temperature were to increase, how would this affect the wavelength of peak emission?
A. It would shift toward shorter wavelengths. B. It would shift toward longer wavelengths. C. It would shift toward longer wavelengths at first, and then toward shorter wavelengths. D. It would not change.
________ radiation is used to cook food and ________ radiation causes sunburn
A) Infrared; ultraviolet B) Microwave; ultraviolet C) X-ray; infrared D) Ultraviolet; infrared
Why is the same side of the moon always facing Earth?
A) The gravitational pull B) The inertia of Earth C) The length of a solar day in comparison to a lunar day D) The tidal friction locked the moon's rotation to that of Earth
An increase in earthquake magnitude by one whole number (for example, from 6 to 7) means that the energy released has increased by a factor of about ____
a. 3 b. 30 c. 300 d. 3000 e. 30,000