This topic contains a solution. Click here to go to the answer

Author Question: Suppose you find a rock that contains 10 micrograms of radioactive potassium-40, which has a ... (Read 57 times)

tsand2

  • Hero Member
  • *****
  • Posts: 520
Suppose you find a rock that contains 10 micrograms of radioactive potassium-40, which has a half-life of 1.25 billion years.
 
  By measuring the amount of its decay product (argon-40 ) present in the rock, you conclude that there must have been 80 micrograms of potassium-40 when the rock solidified. How old is the rock?
  A) 3.75 billion years B) 2.5 billion years C) 5.0 billion years D) 1.25 billion years

Question 2

What is Cygnus X-1?
 
  A) the leading candidate for an observable black hole binary system
  B) a millisecond pulsar with three Earth-like planets around it
  C) the brightest star in the constellation Cygnus
  D) the first gamma-ray burster to be spotted in other wavelengths as well
  E) the strongest X-ray eclipsing binary system in the sky



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

ricroger

  • Sr. Member
  • ****
  • Posts: 352
Answer to Question 1

A

Answer to Question 2

A




tsand2

  • Member
  • Posts: 520
Reply 2 on: Jul 27, 2018
Gracias!


robbielu01

  • Member
  • Posts: 336
Reply 3 on: Yesterday
Excellent

 

Did you know?

About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.

Did you know?

Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.

Did you know?

Tobacco depletes the body of vitamins A, C, and E, which can result in any of the following: dry hair, dry skin, dry eyes, poor growth, night blindness, abscesses, insomnia, fatigue, reproductive system problems, sinusitis, pneumonia, frequent respiratory problems, skin disorders, weight loss, rickets, osteomalacia, nervousness, muscle spasms, leg cramps, extremity numbness, bone malformations, decayed teeth, difficulty in walking, irritability, restlessness, profuse sweating, increased uric acid (gout), joint damage, damaged red blood cells, destruction of nerves, infertility, miscarriage, and many types of cancer.

Did you know?

The types of cancer that alpha interferons are used to treat include hairy cell leukemia, melanoma, follicular non-Hodgkin's lymphoma, and AIDS-related Kaposi's sarcoma.

Did you know?

There used to be a metric calendar, as well as metric clocks. The metric calendar, or "French Republican Calendar" divided the year into 12 months, but each month was divided into three 10-day weeks. Each day had 10 decimal hours. Each hour had 100 decimal minutes. Due to lack of popularity, the metric clocks and calendars were ended in 1795, three years after they had been first marketed.

For a complete list of videos, visit our video library