Author Question: How do geologists know how to determine half-lives and decay-rates? What will be an ideal ... (Read 68 times)

Yolanda

  • Hero Member
  • *****
  • Posts: 757
How do geologists know how to determine half-lives and decay-rates?
 
  What will be an ideal response?

Question 2

Metamorphism usually ________ the radioactive-isotope clock.
 
  A) retains
  B) preserves
  C) maintains
  D) resets



kiamars2010

  • Sr. Member
  • ****
  • Posts: 341
Answer to Question 1

Answer: Radioactive-decay rates are measured in the laboratory by detecting the energy released by each decay event. Decay rates are expressed as the number of decays per unit of time per gram of parent isotope. Decay rates measured in different laboratories are the same within the uncertainty of the measurement. International committees establish the universally used decay rates based on the most reliable and upto-date laboratory values. Laboratory experiments show that decay rates are unaffected by changes in temperature, pressure, variations in gravitational field, or different magnetic fields.

Answer to Question 2

Answer: D



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
 

Did you know?

The oldest recorded age was 122. Madame Jeanne Calment was born in France in 1875 and died in 1997. She was a vegetarian and loved olive oil, port wine, and chocolate.

Did you know?

In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.

Did you know?

The Centers for Disease Control and Prevention has released reports detailing the deaths of infants (younger than 1 year of age) who died after being given cold and cough medications. This underscores the importance of educating parents that children younger than 2 years of age should never be given over-the-counter cold and cough medications without consulting their physicians.

Did you know?

Hypertension is a silent killer because it is deadly and has no significant early symptoms. The danger from hypertension is the extra load on the heart, which can lead to hypertensive heart disease and kidney damage. This occurs without any major symptoms until the high blood pressure becomes extreme. Regular blood pressure checks are an important method of catching hypertension before it can kill you.

Did you know?

Patients should never assume they are being given the appropriate drugs. They should make sure they know which drugs are being prescribed, and always double-check that the drugs received match the prescription.

For a complete list of videos, visit our video library