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 54 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?

Medications that are definitely not safe to take when breastfeeding include radioactive drugs, antimetabolites, some cancer (chemotherapy) agents, bromocriptine, ergotamine, methotrexate, and cyclosporine.

Did you know?

Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.

Did you know?

Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.

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?

After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.

Multiple-dose drug administration: drug A and drug B are administered every 12 hours; drug B reaches Multiple-dose drug administration: drug A and drug B are administered every 12 hours; drug B reaches
Default Activity in the Alzheimer Brain Default Activity in the Alzheimer Brain
Trends in Hurricane Activity Trends in Hurricane Activity
Summary of Cytokine Activity Summary of Cytokine Activity
Radioactive waste Radioactive waste
The Radioactive Decay Curve The Radioactive Decay Curve
Video: Glycolysis Animation

For a complete list of videos, visit our video library