5. An archeological dig uncovers an ancient urn with 20% of element U left in it. If the decay rate for element U is 0.0034, how old is the urn? When will the element U be essentially zero (assuming 1 x 10-10 of element U left)? (round to two significant figures for both) How old is the urn? After how many years will U be essentially zero? years old years 5

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