Unformatted text preview: closed basement, how many grams would be left after 19.00 hours? a. 43.3g b. 1.60g c. 31.0g d. 40.7g e. 18.1g k = .693 / 3.823d = 0.18127 d-1 ln (x/50g) = -0.18127 d-1 (19.00h)(d / 24h) ln x = 3.76852 so x = 43.3 g 5. Carbon-14 has a half-life of 5730 years. How old is a bone that has 77.2% of its carbon-14 remaining? a. 4420y b. 2140y c. 3.60 x 10 4 y d. 1.209y e. 21.39y k = .693 / 5730y = 1.20942 x 10-4 y-1 ln (77.2 / 100) = -1.20942 x 10-4 y-1 (t) t = 2140 y...
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- Radioactive Decay, Electron Capture, electron b. positron, positron d. electron, beta e. proton