A proposed concept or model of nature is tested using the ______________
Fill in the blank(s) with correct word
scientific method
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The critical temperature for nucleosynthesis to begin was the:
A) triple alpha reaction at 100 million K. B) deuterium bottleneck at about 900 million K. C) proton-proton cycle at 10 million K. D) iron production at 10 billion K. E) formation of lithium at 50 million K.
The main practical problem associated with building an interstellar ramjet is
A) making the ship large enough to scoop up enough hydrogen fuel given that the density of hydrogen in space is so low B) producing enough thrust to accelerate the spacecraft to a high enough speed C) separating the matter and antimatter fuels from each other D) receiving enough photon energy to propel the craft
Three +3.0-?C point charges are at the three corners of a square of side 0.50 m. The last corner is occupied by a -3.0-?C charge. Find the magnitude of the electric field at the center of the square. (k = 1/4??0 = 8.99 × 109 N • m2/C2)
What will be an ideal response?
The radioactive isotope 131I (atomic number 53 ) decays to the isotope 131Xe (atomic number 54). What type of radioactive decay is this?
A) electron capture B) electron ionization C) beta decay D) alpha decay