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 76 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?

The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.

Did you know?

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

Did you know?

The human body produces and destroys 15 million blood cells every second.

Did you know?

In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.

Did you know?

The use of salicylates dates back 2,500 years to Hippocrates's recommendation of willow bark (from which a salicylate is derived) as an aid to the pains of childbirth. However, overdosage of salicylates can harm body fluids, electrolytes, the CNS, the GI tract, the ears, the lungs, the blood, the liver, and the kidneys and cause coma or death.

Coupling of electrical and mechanical activity in the mammalian heart. Coupling of electrical and mechanical activity in the mammalian heart.
Men and women work the same number of hours a week, but men spend more time on paid work, and women ... Men and women work the same number of hours a week, but men spend more time on paid work, and women ...
The activity pyramid. The activity pyramid.
Conventional view of economic activity Conventional view of economic activity
Brain Hemisphere Activity Brain Hemisphere Activity
A carbon-14 nucleus decays to a nitrogen-14 nucleus by beta-minus decay. How much energy (in ... A carbon-14 nucleus decays to a nitrogen-14 nucleus by beta-minus decay. How much energy (in ...
Video: Regulation of GFR: autoregulation via myogenic mechanism Myogenic mechanism

For a complete list of videos, visit our video library