After two half-lives, there is no longer any of the original radioactive material remaining.
a. true
b. false
b. false
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The electric field about a proton decreases in magnitude
A. via the inverse-square law. B. when between oppositely charged parallel plates. C. in linear fashion. D. none of the above
Human demands and pressures have surpassed Earth's ability to regenerate resources
Indicate whether the statement is true or false
Which of the following best explains why the dependency ratio in South Asia has been declining?
A) The decreasing birth rate has resulted in fewer children dependent on social services. B) The increasing population in the region has resulted in more working-age people who depend on social services. C) The longer life expectancy has allowed people to work for more years, thus not being dependent on others for social services. D) The life expectancy in South Asia has been declining because of natural disasters and diseases, so there are fewer elderly citizens to take care of.
Acids and bases are highly reactive; therefore, they can cause important environmental problems.
Answer the following statement true (T) or false (F)