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

Author Question: Radium occurs only in uranium ores, typically with an observed Ra/U ratio of 1mg/3kg. Uranium ores ... (Read 95 times)

audragclark

  • Hero Member
  • *****
  • Posts: 579

Question 1

If the age of the Earth is 4.5 billion years and the half-life of 40K is 1.26 billion years, what percent of the Earth's original amount of 40K remains today?
◦ 16%
◦ 4.2%
◦ 8.4%
◦ 12%

Question 2

Radium occurs only in uranium ores, typically with an observed Ra/U ratio of 1mg/3kg. Uranium ores normally contain only about 200 ppm of U. How many kilograms of uranium ore must be processed to obtain 1 mg of radium?
◦ 6.0 × 108 kg ore
◦ 15,000 kg ore
◦ 1700 kg ore
◦ None of these


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by audragclark on Feb 15, 2020

jessicaduplan

  • Sr. Member
  • ****
  • Posts: 337
Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.
Answer Preview
Only 49% of students answer this correctly




audragclark

  • Member
  • Posts: 579
Reply 2 on: Feb 15, 2020
:D TYSM


cpetit11

  • Member
  • Posts: 321
Reply 3 on: Yesterday
Excellent

 

Did you know?

For high blood pressure (hypertension), a new class of drug, called a vasopeptidase blocker (inhibitor), has been developed. It decreases blood pressure by simultaneously dilating the peripheral arteries and increasing the body's loss of salt.

Did you know?

The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").

Did you know?

Complications of influenza include: bacterial pneumonia, ear and sinus infections, dehydration, and worsening of chronic conditions such as asthma, congestive heart failure, or diabetes.

Did you know?

The shortest mature adult human of whom there is independent evidence was Gul Mohammed in India. In 1990, he was measured in New Delhi and stood 22.5 inches tall.

Did you know?

Stroke kills people from all ethnic backgrounds, but the people at highest risk for fatal strokes are: black men, black women, Asian men, white men, and white women.

For a complete list of videos, visit our video library