Radiometric Dating For this week’s assignment, please answer EACH of the followi
ID: 266331 • Letter: R
Question
Radiometric Dating
For this week’s assignment, please answer EACH of the following questions/prompts,and post them to the drop box as a single document.
Name the three kinds of strength used to characterize materials AND give an example of a material that are strong in each of these modes.
What kinds of bonding occurs in each of the three materials you listed in question #1?
Explain how atoms can be arranged in such a way to create a permanent magnet.
Identify 10 objects in your home that use semiconductors. What other kinds of materials with special electrical properties are found in all of these 10 objects?
Research the status of magnetically levitated trains like the one now operating in China. How does it operate? How fast might it go?
How does a nuclear reactor work?
What types of researchers and scientists use carbon-14 radiometric dating? What type of researcher would use the other isotopes such as uranium-238?
Use the periodic table to identify the element, its atomic number, mass number and electrical charge of the following:
Potassium-40 decays into argon-40 with a half-life of 1.2 billion years. A particular mineral grain is known to have had a million potassium atoms in its crystal structure when it formed. When the grain was ground up, scientists discovered 750,000 atoms of argon-40. When did the grain form? (Hint: Use Figure 12-10 on page 272 to obtain a qualitative estimate).
What are the half-lives of the following common isotopes:
Carbon-14:
Uranium-238:
Uranium-235:
IN YOUR OWN WORDS!!!!! PLEASE NO PLAGIARISM!!!!!
# Protons # Neutrons # Electrons Element Symbol Atomic Number Mass Electrical Charge 1 0 1 8 8 8 17 18 18 36 50 36Explanation / Answer
Q. Explain how atoms can be arranged in such a way to create a permanent magnet.
A. Permanent magnets are called so because they remain magnatized without any external influence of a magnetic field. Permanent magnets can either be created by using materials like steel or iron that remain magnatized, or by exposing such material to a very strong magnetic field.
The spinning of electrons in an atom exerts a magnetic field. This makes every atom a dipole (as they have a magnetic north pole and magnetic south pole). Many dipoles together form a domain. In the presence of a very strong magnetic field, a domain arranges itself in a particular orientation. When the domain remains aligned in the same orientation on removal of the strong magnetic field, and itself has a strong magnetic field, it has become a permanent magnet.
Q. Research the status of magnetically levitated trains like the one now operating in China. How does it operate? How fast might it go?
A. Magnetic levitation (Maglev) works with the help of two types of magents, one that repels and makes the train levitate by pushing it upwards, and the other that is responsible for the frictioness high speed movement of the train. The magnets control the train's speed and stability and may go as fast as 431 kmph (268 mph).
Q. How does a nuclear reactor work?
A. The mechanism of how a nuclear reactor works is as follows -
Q. What types of researchers and scientists use carbon-14 radiometric dating? What type of researcher would use the other isotopes such as uranium-238?
A. Carbon-14 radiometric dating is used for dating organisms, as carbon is a vital part of a living organism. It is generally used to date fossils and archaeological specimens that are about 500 to 50,000 years old, since C-14 has a half-life of 5,730 ± 40 years.
Uranium is one of the main elements present in the Earth's mantle and core, and is said to be the source of heat in these. Isotopes of uranium like uranium-234 (234U) and uranium-238 (238U) are widely used in radiometric dating. 238U has a half-life of about 4.5 billion years, making its use advantageous in knowing more about the Earth's mantle and ocre, and the movement of the plate tectonics.
Based upon their use, scientists can make use of these radiometric techniques.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.