« previous next »

Author Question: A 1.0-mol sample of an isotope is decaying with a half-life of 28 y. After 61 y, how many moles of ... (Read 98 times)

genevieve1028

  • Hero Member
  • *****
  • Posts: 601
on: Jul 29, 2018
A 1.0-mol sample of an isotope is decaying with a half-life of 28 y. After 61 y, how many moles of this isotope are left and what is its activity in Bq?
 
  What will be an ideal response?

Question 2

What is the steady state rate of heat flow through a pane of glass that is 40.0 cm by 30.0 cm with a thickness of 4.00 mm when the outside temperature of the glass is -10.0C and its inside temperature is 25.0C?
 
  The thermal conductivity of glass is 0.105 W/(mK), the specific heat of glass is 0.180 cal/(gC), and 1 cal = 4.190 J.
  A) 3.81 W B) 110 W C) 24.2 W D) 47.3 W E) 18.6 W


Silverbeard98

  • Sr. Member
  • ****
  • Posts: 355
Reply #1 on: Jul 29, 2018
Answer to Question 1

0.22 mol, 1.0  1014 Bq

Answer to Question 2

B


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.

Did you know?

People who have myopia, or nearsightedness, are not able to see objects at a distance but only up close. It occurs when the cornea is either curved too steeply, the eye is too long, or both. This condition is progressive and worsens with time. More than 100 million people in the United States are nearsighted, but only 20% of those are born with the condition. Diet, eye exercise, drug therapy, and corrective lenses can all help manage nearsightedness.

Did you know?

Bisphosphonates were first developed in the nineteenth century. They were first investigated for use in disorders of bone metabolism in the 1960s. They are now used clinically for the treatment of osteoporosis, Paget's disease, bone metastasis, multiple myeloma, and other conditions that feature bone fragility.

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?

Limit intake of red meat and dairy products made with whole milk. Choose skim milk, low-fat or fat-free dairy products. Limit fried food. Use healthy oils when cooking.

How to solve all of life's problems How to solve all of life's problems
Jan de Heem, Still Life with Lobster. Jan de Heem, Still Life with Lobster.
Sample Items from the Brief Multidimensional Measure of Religiousness/Spirituality (BMMRS) Sample Items from the Brief Multidimensional Measure of Religiousness/Spirituality (BMMRS)
The isotope record The isotope record
Sample Inclusion for Various s Sample Inclusion for Various s
Sample hypnograms of children, young adults, and older adults Sample hypnograms of children, young adults, and older adults
Video: Structures that affect circulation - arterioles and vasomotor responses

For a complete list of videos, visit our video library