Read "Who Built the Pyramids?”. Leave this link open while you answer the questions throughout the assignment. Give at least two reasons why some people claim the Pyramids of Giza were constructed by aliens.

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

the answer is 303.15 or 303

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally

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