What unstable isotope would be best to refine the date of bones found in a cave hearth built by humans between 30,000 and 50,000 years ago?

Carbon - 14 Isotope

Explanation:

Carbon - 14 is an unstable and weak radioactive carbon isotope that is used to determine the age of an organic matter (i.e Carbon Dating).

The unstable isotope that would be best to refine the date of bones found in a cave hearth between 30,000 and 50,000 years ago is carbon-14 (C-14). Usually, C-14 is used to estimate the age of decomposed organisms that existed within any age less than 50,000 years ago from a recent date; therefore, C-14 would be best for any age between 30,000 and 50,000 years ago.

answer: question1

1,000 tons

question2

3: 8

question 3

store d

step-by-step explanation:

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: