Physics, 21.05.2020 05:04, tiffanibell71
The theory of nuclear astrophysics is that all the heavy elements like uranium are formed in the interior of massive stars. These stars eventually explode, releasing these elements into space. If we assume that at the time of the explosion there were equal amount of U-235 and U-238, how long ago did the star(s) explode that released the elements that formed our Earth? The present U-235/U-238 ratio is 0.00700. [The half-lives of U-235 and U-238 are 0.700 × 109 yr and 4.47 × 109 yr.]
Answers: 2
Physics, 22.06.2019 03:00, vinp190p9zekn
Which boundary is associated with the building of the himalaya mountains? convergent transform divergent hot spot
Answers: 1
Physics, 22.06.2019 12:00, Redeyestudio53
This is for my 8th grade science class, i really don’t understand. can someone me? , lol.
Answers: 1
Physics, 22.06.2019 13:00, mandilynn22
Nacidified solution was electrolyzed using copper electrodes. a constant current of 1.18 a caused the anode to lose 0.584 g after 1.52 ✕ 103 s. given that the charge of an electron is 1.6022 ✕ 10−19 c, calculate avogadro's number. assume that copper is oxidized to cu2+ ions.
Answers: 1
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