An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?
Answer (2)
Boron-11 and Boron-10 are analyzed.
The number of protons and neutrons in each atom are compared.
Since the number of protons is the same and the number of neutrons is different, they are isotopes.
The correct relationship is that they are isotopes, so the answer is b
Explanation
Understanding the Problem We are given two boron atoms: Boron-11 ( 5 11 B ) and Boron-10. We need to determine the relationship between these two atoms.
Analyzing the Atoms Boron-11 has 5 protons and 6 neutrons. Boron-10 has 5 protons and 5 neutrons.
Determining the Relationship Isotopes are atoms of the same element with different numbers of neutrons. Since both atoms have the same number of protons (5), they are the same element. Since they have different numbers of neutrons (6 and 5, respectively), they are isotopes.
Conclusion Therefore, the correct relationship between Boron-11 and Boron-10 is that they are isotopes.
Examples
Isotopes are used in various fields, such as carbon dating in archaeology to determine the age of ancient artifacts, and in medicine for diagnostic imaging and cancer treatment. Understanding isotopes helps scientists trace the origins and movements of substances in environmental studies, ensuring accurate analysis and informed decision-making. For example, radioactive isotopes can be used as tracers to follow the flow of water or pollutants in a river system, providing valuable data for environmental management and conservation efforts.
The total charge that flows through an electric device delivering a current of 15.0 A for 30 seconds is 450 coulombs. This corresponds to approximately 2.81 × 10²¹ electrons flowing through the device. The calculation is based on the charge of an electron being 1.6 × 10⁻¹⁹ coulombs.
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