ch. 13, and 14 study review

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A sample of radioactive waste has a half-life of 20 years and an activity level of 4 curies. After how many years will the activity level of this sample be 0.50 curies?

60 years

Uranium-235 has a half-life of 710 million years. If a certain amount is considered safe after the radioactivity has dropped to 0.10 percent of the original level, how long must the uranium-235 be stored to be safe?

7.1 x 10^9 years because 710 x 10^6 = X. ( or 10 half lives)

what energy source leads to deforestation?

biomass

Hydroelectric power plants have many negative environmental impacts such as

destruction of fish habitats and migration

A problem associated with nuclear power plants is

disposal of radioactive waste

Which of the following energy sources is not made directly or indirectly from the sun?

geothermal

what energy source can be utilized in areas with volcanic activity?

geothermal

what energy source destroys landscapes by flooding them?

hydropower

What supplies the most commercial energy in the world today?

oil

In contrast to low-level radioactive waste, most high-level radioactive waste in the United States in currently

stored at reactor sites

compared to a coal-fired power plant, a nuclear power plant generates more

thermal pollution

what energy source can only be used in a few places in the world?

tidal

Which of the following metals is considered an energy resource?

uranium

what energy source has been linked to deaths of migratory birds?

wind power


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