Physics, 22.02.2022 03:00 marquezbell6577
Carbon-14 is an isotope, with a half- life of 5730yrs, naturally occurring in the air. This means that all living things maintain a fixed ratio of carbon-14 to the stable carbon-12. In a 1g sample there would be 180 000 C-14 atoms. This number starts to drop the moment the living thing stops respiring.
a) A 1g scraping of the charcoal from a cave painting in France contained 45000 C-14 atoms.
i) How many half-lives had passed since the tree (that made the charcoal) was felled?
if) When was the painting made?
b) For many years it was believed that the Romans were the first to introduce grapes to
Britain. A 0.02g grape pip found at the British hillfort of Hambledon Hill contained 1800 C-14 atoms.
i) How many C-14 atoms would there have been in 1g of grape pip?
ii) How many half-lives had passed since the grape was picked?
iii) How long ago was the grape picked? iv. What evidence does this give for the introduction of grapes to Britain?
Answers: 3
Physics, 22.06.2019 12:10
Point charges q1 = 51 µc and q2 = −27 µc are placed 1.0 m apart, with q2 on the right. what is the force (in n) on a third charge q3 = 19 µc placed midway between q1 and q2? (assume the positive direction is to the right. indicate the direction with the sign of your answer.)
Answers: 3
Physics, 22.06.2019 15:00
You want to lose weight and have been trying to decide which type of fad diet is best for you. you ask your doctor, who responds that a. fad diets are a temporary fix but generally don't have any side effects b. fad diets can be used several times a year to maintain a healthy weight c. fad diets can be risky for your health and, in the long run, do not work d. fad diets should never be used one right after the other; there should be a break between them select the best answer from the choices provided. a b c d
Answers: 1
Carbon-14 is an isotope, with a half- life of 5730yrs, naturally occurring in the air. This means th...
Mathematics, 10.07.2021 02:40
Mathematics, 10.07.2021 02:40
Mathematics, 10.07.2021 02:40
History, 10.07.2021 02:50
Mathematics, 10.07.2021 02:50
History, 10.07.2021 02:50
Chemistry, 10.07.2021 02:50
English, 10.07.2021 03:00
Biology, 10.07.2021 03:00
Chemistry, 10.07.2021 03:00
Mathematics, 10.07.2021 03:00
Mathematics, 10.07.2021 03:00