Explanation:
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They are found in group 3 of the periodic table.
Base on the question all about the human eye were an optic nerve of it needs an energy of 2.10x10^-17J that could trigger a series of impulses that eventually reach to the brain. So the possible photons of blue light needed for for this energy is 52 photons
T(F) = T(C) * 9/5+ 32
T(F) = 50 * 9/5 + 32
= 122 degrees Fahrenheit
