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

Author Question: The half-life of 19N is 0.42 s. What is the decay constant for this isotope? a. 1.7 1011 Ci b. ... (Read 81 times)

dejastew

  • Hero Member
  • *****
  • Posts: 562
on: Jul 28, 2018
The half-life of 19N is 0.42 s. What is the decay constant for this isotope?
 a. 1.7  1011 Ci
  b. 1.7 s1
  c. 1.1 s1
  d. The decay constant is not defined for a half-life of less than one second.

Question 2

The half-life of radioactive Technetium-99 is 6.0 hours. Find the number of 99Tc nuclei necessary to produce a sample of activity 18 Ci. (1 Ci = 3.7  1010 decays/second)
 a. 1.2  109
  c. 8.0  108
  b. 3.4  1011
  d. 2.1  1010


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

moormoney

  • Sr. Member
  • ****
  • Posts: 326
Reply #1 on: Jul 28, 2018
Answer to Question 1

B

Answer to Question 2

D


dejastew

  • Member
  • Posts: 562
Reply 2 on: Jul 28, 2018
:D TYSM

meganmoser117

  • Member
  • Posts: 303
Reply 3 on: Yesterday
Wow, this really help

« previous next »
 

Did you know?

Certain topical medications such as clotrimazole and betamethasone are not approved for use in children younger than 12 years of age. They must be used very cautiously, as directed by a doctor, to treat any child. Children have a much greater response to topical steroid medications.

Did you know?

Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.

Did you know?

Adults are resistant to the bacterium that causes Botulism. These bacteria thrive in honey – therefore, honey should never be given to infants since their immune systems are not yet resistant.

Did you know?

People often find it difficult to accept the idea that bacteria can be beneficial and improve health. Lactic acid bacteria are good, and when eaten, these bacteria improve health and increase longevity. These bacteria included in foods such as yogurt.

Did you know?

Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.

Seven characteristics are common to all life Seven characteristics are common to all life
Gossip and ridicule increase the status insecurity of this time of life. Gossip and ridicule increase the status insecurity of this time of life.
The energy cycle of life The energy cycle of life
Remaining health-adjusted life expectancy (years) at age 25 Remaining health-adjusted life expectancy (years) at age 25
For a particular process that is carried out at constant pressure, q = 145 kJ and w = -35 kJ. ... For a particular process that is carried out at constant pressure, q = 145 kJ and w = -35 kJ. ...
Life cycle of Dictyostelium discoideum, a cellular slime mold Life cycle of Dictyostelium discoideum, a cellular slime mold
Video: Major Elements in Biological Molecules: Proteins

For a complete list of videos, visit our video library