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Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?
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An object resting on a table weighs 100 n. with what force is the object pushing on the table? with what force is the table pushing on the object? explain how you got your answer.
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As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit
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Which of the following has expanded our knowledge of the universe beyond our solar system the most? a. manned space travel b. the hubble space telescope c. the pioneer and voyager missions d. the international space station
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If a rock initially contained 10 milligrams of a radioactive substance when it first formed, how muc...
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