In order to apply the isotope-dating method, what must be known or measured, and what conditions must be met?
What will be an ideal response?
The half-life or decay rate must be known. There must be no daughter isotope present when the rock forms or we must be able to determine how much daughter was present. No parent isotope can be lost or gained from the rock since it formed. No daughter isotope can be lost or gained from the rock since it formed and radioactive decay begins. Accurate measurements of the abundances of parent and daughter isotopes, and the half-life value of decay. As instrumentation improves, the ability to detect and measure parent and daughter isotopes improves as well as improved precision. As precision increases, accuracy will too.
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Phil tosses a ball horizontally from a rooftop. One second after leaving his hand the ball's vertical component of velocity is about
A. 20 m/s. B. 10 m/s. C. 14 m/s. D. 5 m/s.
What is the difference between a slip plane in a plastically deforming crystal and a slip plane associated with brittle faulting?
What will be an ideal response?
The maximum of each species that can be caught without impairing future populations of that species is called the ____
A) maximum sustainable yield B) annual catch C) maximum global landing D) unsustainable yield
Which of the following is true?
A) The N-H bond is nonpolar. B) The polarity of the N-H bond is less than that of the O-H bond. C) The polarity of the N-H bond is the same as that of the O-H bond. D) The polarity of the N-H bond is greater than that of the O-H bond.