« previous next »

Author Question: Tritium has a half-life of 12.3 years. How many years will elapse when the radioactivity of a ... (Read 152 times)

olgavictoria

  • Hero Member
  • *****
  • Posts: 528
on: Jul 28, 2018
Tritium has a half-life of 12.3 years. How many years will elapse when the radioactivity of a tritium sample diminishes to 30 of its original value?
 a. 29 years
  c. 86 years
  b. 21 years
  d. 57 years

Question 2

A pure sample of 226Ra contains 3.0  1014 atoms of the isotope. If the half-life of 226Ra = 1.6  103 years, what is the decay rate of this sample? (1 Ci = 3.7  1010 decays/s)
 a. 2.7  10-12 Ci
  c. 3.4  10-10 Ci
  b. 11  10-8 Ci
  d. 7.4  10-8 Ci


ecabral0

  • Sr. Member
  • ****
  • Posts: 310
Reply #1 on: Jul 28, 2018
Answer to Question 1

B

Answer to Question 2

B


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.

Did you know?

A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.

Did you know?

Approximately 25% of all reported medication errors result from some kind of name confusion.

Did you know?

Street names for barbiturates include reds, red devils, yellow jackets, blue heavens, Christmas trees, and rainbows. They are commonly referred to as downers.

Did you know?

Asthma cases in Americans are about 75% higher today than they were in 1980.

Life on Earth Life on Earth
Life-cycle of the Sun; sizes are not drawn to scale. Life-cycle of the Sun; sizes are not drawn to scale.
The four stages of life expressed in five different primates. The four stages of life expressed in five different primates.
Results from sequential study of two cohorts tested at three ages and at three different points in t Results from sequential study of two cohorts tested at three ages and at three different points in t
Hormonal Changes in Puberty Girls and boys follow very different hormonal paths at this life stage Hormonal Changes in Puberty Girls and boys follow very different hormonal paths at this life stage
HIV-positive men with a high number of life stressors progress more quickly to AIDS than those with ... HIV-positive men with a high number of life stressors progress more quickly to AIDS than those with ...
Video: Facilitated Diffusion - Glucose transport

For a complete list of videos, visit our video library