Physics, 26.08.2019 07:30, eddiecas

How so scientist use radioactive decay to date fossils and artifacts

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The most important example of radioactive decay used to date fossils and artifacts is the decay of Carbon-14.

Carbon-14 is constantly being created in the atmosphere, and it is constantly taken by all living organisms by heating/breathing. At the same time, carbon-14 also decays, so that in living organisms the amount of carbon-14 remains constant. However, when the organism dies, it does not take anymore carbon-14 from the environment, so the amount of carbon-14 starts to decrease according to a precise rule.

Carbon-14 has a half-life of 5730 years: this means that after this time, the amount of carbon-14 left in the dead organism is half the initial amount. Based on this fact, it is possible to infer the age of a fossil by measuring the amount of carbon-14 left. The relationship between the amount of Carbon-14 left at time t, N(t), and the amount of carbon-14 initially present in the fossil is given by
$N(t)=N_0 e^{-t/t_{1/2}}$
where $t_{1/2}$ is the half life of carbon-14. By measuring N(t) and by knowing N_0

, it is possible to calculate t, the age of the fossil.

answered: Guest

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm. the wire diameter is d = 0.9 mm. the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2) in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

answered: Guest

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