a. The skull should be dated by the carbon-14 method, since this is the method used for organic material older than 1 million years.
Explanation:
The skull can be given an absolute age as it lies in a layer between the two sills. These igneous layers flow not the sills, as they have not baked by the sedimentary rocks that are found above and below them. The sedimentary rocks themselves cant be dated radio-metrically. Theses skull could be more than 100,000 years old as the genus of the homo has existed since then and now.
a. The skull should be dated by the carbon-14 method, since this is the method used for organic material older than 1 million years.
Explanation:
The skull can be given an absolute age as it lies in a layer between the two sills. These igneous layers flow not the sills, as they have not baked by the sedimentary rocks that are found above and below them. The sedimentary rocks themselves cant be dated radio-metrically. Theses skull could be more than 100,000 years old as the genus of the homo has existed since then and now.
Answer: b. Fiona is correct because the diagram shows two individual simple machines.
Explanation:
A mechanical device using which we can change the direction or magnitude of force applied is known as simple machine.
For example, in the given diagram there are two individual simple machines.
The machine helps in changing the direction or magnitude of force applied by the man. As a result, it becomes easy for him to carry different things easily from one place to another.
Thus, we can conclude that the statement Fiona is correct because the diagram shows two individual simple machines, is correct.
15 moles.Explanation:Hello,In this case, the undergoing chemical reaction is:Clearly, since carbon and oxygen are in a 1:1 molar ratio, 15 moles of carbon will completely react with 15 moles of oxygen, therefore 15 moles of oxygen remain as leftovers. In such a way, since carbon and carbon dioxide are also in a 1:1 molar ratio, the theoretical yield of carbon dioxide is 15 moles based on the stoichiometry:Best regards.
Answer: 25 g
Explanation: Given:
Original amount (N₀) = 100 g
Number of half-lives (n) = 11460/5730 = 2
Amount remaining (N) = ?
N = 1/2ⁿ × N₀
N = 1/2^2 × 100
N = 0.25 × 100
N = 25 g
Answer: 7.8125 g
Explanation: Given:
Original amount (N₀) = 500 g
Number of half-lives (n) = 9612/1602 = 6
Amount remaining (N) = ?
N = 1/2ⁿ × N₀
N = 1/2^6 × 500
N = 0.015625 × 500
N = 7.8125 g
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