This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: A rock sample contains 1/4 micrograms of the parent radioactive isotope K-40 and 3/4 micrograms of ... (Read 88 times)

OSWALD

  • Hero Member
  • *****
  • Posts: 580
on: Jul 27, 2018
A rock sample contains 1/4 micrograms of the parent radioactive isotope K-40 and 3/4 micrograms of its daughter isotope Ar-40. If the half-life of this decay is 1.25 billion years, how old is this rock?
 
  A) 5.00 billion years
  B) 3.75 billion years
  C) 1.25 billion years
  D) 2.50 billion years

Question 2

Starting from rest, a proton falls through a potential difference of 1.2 kV. What speed does it acquire?
 
  What will be an ideal response?


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

kardosa007

  • Sr. Member
  • ****
  • Posts: 300
Reply #1 on: Jul 27, 2018
Answer to Question 1

D

Answer to Question 2

4.8  105 m/s


OSWALD

  • Member
  • Posts: 580
Reply 2 on: Jul 27, 2018
Wow, this really help

brbarasa

  • Member
  • Posts: 308
Reply 3 on: Yesterday
Gracias!

« previous next »
 

Did you know?

HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.

Did you know?

Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.

Did you know?

Historic treatments for rheumatoid arthritis have included gold salts, acupuncture, a diet consisting of apples or rhubarb, nutmeg, nettles, bee venom, bracelets made of copper, prayer, rest, tooth extractions, fasting, honey, vitamins, insulin, snow collected on Christmas, magnets, and electric convulsion therapy.

Did you know?

The longest a person has survived after a heart transplant is 24 years.

Did you know?

For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.

How Seismic Waves Pass through Rock How Seismic Waves Pass through Rock
Volcanoes Are Rock Factories Volcanoes Are Rock Factories
Sample of an informed consent to perform an operation, sedation, anesthesia, and other medical servi Sample of an informed consent to perform an operation, sedation, anesthesia, and other medical servi
Tummy rock to release energy blocks in the torso and head. Tummy rock to release energy blocks in the torso and head.
The isotope record The isotope record
A 230.0-mL sample of a 0.275 M solution is left on a hot plate overnight; the following morning ... A 230.0-mL sample of a 0.275 M solution is left on a hot plate overnight; the following morning ...
Video: Ear Virtual Tour Animation

For a complete list of videos, visit our video library