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

Author Question: A certain substance has a half-life of 5.0 hours. How many nuclei of the substance are required to ... (Read 69 times)

MirandaLo

  • Hero Member
  • *****
  • Posts: 538
on: Jul 29, 2018
A certain substance has a half-life of 5.0 hours. How many nuclei of the substance are required to give an initial activity of 6.0 Ci? 1 Ci = 3.7  Bq.
 
  A) 5.8  109
  B) 8.5  108
  C) 6.3  108
  D) 3.2  109
  E) 2.4  109

Question 2

The carbon in your body was formed in nuclear reactions in long-dead stars. How much energy was released when three 4He nuclei combined to make 12C? The mass of 4He is 4.002603 u, the mass of 12C is 12.0000 u, and 1 u = 931.494 MeV/c2.
 
  A) 7.274 MeV
  B) 3716 MeV
  C) 8.424 MeV
  D) 2.106 MeV


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

okolip

  • Sr. Member
  • ****
  • Posts: 362
Reply #1 on: Jul 29, 2018
Answer to Question 1

Answer: A

Answer to Question 2

Answer: A


MirandaLo

  • Member
  • Posts: 538
Reply 2 on: Jul 29, 2018
Wow, this really help

ryansturges

  • Member
  • Posts: 338
Reply 3 on: Yesterday
Great answer, keep it coming :)

« previous next »
 

Did you know?

Human kidneys will clean about 1 million gallons of blood in an average lifetime.

Did you know?

Excessive alcohol use costs the country approximately $235 billion every year.

Did you know?

Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.

Did you know?

Medication errors are three times higher among children and infants than with adults.

Did you know?

Coca-Cola originally used coca leaves and caffeine from the African kola nut. It was advertised as a therapeutic agent and "pickerupper." Eventually, its formulation was changed, and the coca leaves were removed because of the effects of regulation on cocaine-related products.

Origin of the plant life cycle. Origin of the plant life cycle.
Life Cycle of Lobster Life Cycle of Lobster
Normal changes in the breast during a woman's life span Normal changes in the breast during a woman's life span
In 1891 William Dean Howells championed the poetry of Emily Dickinson: “This poetry is as characteri In 1891 William Dean Howells championed the poetry of Emily Dickinson: “This poetry is as characteri
Label used to indicate a class IV controlled substance. Label used to indicate a class IV controlled substance.
The distribution of the number of hours that a random sample of people spend doing chores per ... The distribution of the number of hours that a random sample of people spend doing chores per ...
Video: Decubitus Ulcer

For a complete list of videos, visit our video library