Physics, 16.06.2020 22:57 flyingcerberus1408
The carbon dating method discussed in the video is useful for determining the ages of living materials that are a few thousand or a few tens of thousands years old. K-40 decays into Ar-40 with a half life of 1.2 billion years, making it suitable for estimating the age of very old astronomical objects (for the simplicity of this problem, we assume that this is the only possible decay for K-40). Assume that when a particular rock formed, it had a decay rate of 0.061 decays/sec/g, and it now has a decay rate of 0.015 decays/sec/g. Using the estimation method in the video, which is the closest estimate for the age of this rock?
a. 0.3 billion years
b. 0.6 billion years
c. 1.2 billion years
d. 2.4 billion years
e. 4.8 billion years
Answers: 3
Physics, 22.06.2019 09:00
What changes occur in the brain during the teenage years? 25 points, someone me out!a.) thinking becomes slower as the brain grows larger. b.) connections between neurons become stronger and faster. c.) unused neurons fuse together to form larger, better functioning neurons. d.) more neurons are developed.
Answers: 2
Physics, 22.06.2019 14:40
14. a body is projected with velocity vi from a.at the same time another body is projectedvertically upwards from point b withvelocity v2 lies vertically below the highestpoint. both the bodies collide thenv2÷v1is
Answers: 1
Physics, 22.06.2019 23:00
Which type of reaction is shown in this energy diagram? energy products activation energy reactants time o a. endothermic, because energy is released to the surroundings o b. exothermic, because energy is absorbed from the surroundings o c. exothermic, because energy is released to the surroundings o d. endothermic, because energy is absorbed from the surroundings
Answers: 1
The carbon dating method discussed in the video is useful for determining the ages of living materia...
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