After broken wave water rushes up the beach face as far as it will go, it returns toward the water body as ____________________
Fill in the blank(s) with correct word
backwash
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The original reactor built in 1942 was just "barely" critical because the natural uranium that was used contained less than 1% of the fissionable isotope U-235 (half-life 713 million years)
What if, in 1942, the Earth had been 9 billion years old instead of 4.5 billion years old? Would this reactor have reached critical stage with natural uranium? Why? A) No. The age of the Earth has nothing to do with the reactor reaching critical stage with U-235. B) No. 1% of the fissionable isotope U-235 is insufficient for the reactor to reach critical stage no matter what the age of the Earth. C) Yes. If the Earth had been twice as old there would have then been twice as much fissionable U-235 present and the reactor would have reached critical stage. D) No. The increased age of the Earth would mean that there would be a much smaller percentage of U-235, thus not enough for the reactor to reach critical stage.
Which of the following is found in both baking soda and baking powder?
A) NaHCO3(s) B) KH2PO4(s) C) both a and b D) neither a nor b
Judge the following sentence according to the criteria given below: Many microscopic zooplankton are omnivores BECAUSE they eat other zooplankton in addition to phytoplankton
A) The assertion and the reason are both correct, and the reason is valid. B) The assertion and the reason are both correct, but the reason is invalid. C) The assertion is correct, but the reason is incorrect. D) The assertion is incorrect, but the reason is correct. E) Both the assertion and the reason are incorrect.
The Sun is a star in the ________ galaxy
A) Orion B) Milky Way C) Proxima Centauri D) Alpha Centauri E) Betelgeuse