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

Author Question: A radioactive material initially is observed to have an activity of 1000 decays/sec. If nine hours ... (Read 30 times)

vicotolentino

  • Hero Member
  • *****
  • Posts: 552
on: Jul 28, 2018
A radioactive material initially is observed to have an activity of 1000 decays/sec. If nine hours later it is observed to have an activity of 125 decays/s, what is its half-life?
 a. 1/2 hour
  c. 3 hours
  b. 8 hours
  d. 1 hour

Question 2

Neglecting recoil of the gold nucleus, how much kinetic energy must an alpha particle (charge = 2  1.6  10-19 C) have to approach to within 1.95  10-14 m of a gold nucleus (charge = 79  1.6  10-19 C)? (ke = 8.99  109 Nm2/C2 and 1 MeV = 1.6  10-13 J)
 a. 14.6 MeV
  c. 18.2 MeV
  b. 11.7 MeV
  d. 22.7 MeV


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

joechoochoy

  • Sr. Member
  • ****
  • Posts: 306
Reply #1 on: Jul 28, 2018
Answer to Question 1

C

Answer to Question 2

B


vicotolentino

  • Hero Member
  • *****
  • Posts: 552
Reply #2 on: Jul 28, 2018
TY


joechoochoy

  • Sr. Member
  • ****
  • Posts: 306
Reply #3 on: Jul 28, 2018
You're welcome


« previous next »
 

Did you know?

Liver spots have nothing whatsoever to do with the liver. They are a type of freckles commonly seen in older adults who have been out in the sun without sufficient sunscreen.

Did you know?

Many supplement containers do not even contain what their labels say. There are many documented reports of products containing much less, or more, that what is listed on their labels. They may also contain undisclosed prescription drugs and even contaminants.

Did you know?

The average person is easily confused by the terms pharmaceutics and pharmacology, thinking they are one and the same. Whereas pharmaceutics is the science of preparing and dispensing drugs (otherwise known as the science of pharmacy), pharmacology is the study of medications.

Did you know?

Warfarin was developed as a consequence of the study of a strange bleeding disorder that suddenly occurred in cattle on the northern prairies of the United States in the early 1900s.

Did you know?

Alcohol acts as a diuretic. Eight ounces of water is needed to metabolize just 1 ounce of alcohol.

The medical assistant spends many hours on the telephone assisting patients. The medical assistant spends many hours on the telephone assisting patients.
Trends in Hurricane Activity Trends in Hurricane Activity
Radioactive waste Radioactive waste
Sensation Activity: Sight (2 of 2) Sensation Activity: Sight (2 of 2)
Social Media Dependency Activity Social Media Dependency Activity
Daily Alertness Activity (2 of 2) Daily Alertness Activity (2 of 2)
Video: Spinal Cord Injury Animation

For a complete list of videos, visit our video library