Inadvertently, the human page turner, that fallible and sometimes reviled third party onstage, has been absent from most of Haywoodâs recent performances, a consequence of the wireless age. The advantages are obvious: The iPad is portable, discreet, always well-rested.
He measured the half-life of Carbon-14 to be about 5,568 years. However after about 50,000 years there is so little Carbon-14 left in the specimen that it is very hard, almost impossible, to calculate its age. (Van Der Merwe) Libby ran many tests on items where the age was known, or estimated by other means.
a) Carbon-14 has a short half-life and too little is left after 50,000 years. b) Carbon-14 has a long half-life and not enough has decayed by 50,000 years. c) Carbon-14 has been introduced as an impurity in objects 50,000 years old.d) Carbon-14 has only existed on Earth during the last 50,000 years. 21. geologist uses carbon-14 to measure the age of material found in a sedimentary deposit. If the half-life of carbon-14 is 5,700 years and the sample shows that only 25% of the original carbon-14 is left, the age of the sample is a) 5,700 years b) 11,400 years c) 17,100 years d) 22,800 years. 23.