« previous next »

Author Question: Tritium has a half-life of 12.3 years. How many years will elapse when the radioactivity of a ... (Read 128 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?

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?

If all the neurons in the human body were lined up, they would stretch more than 600 miles.

Did you know?

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

Did you know?

Bisphosphonates were first developed in the nineteenth century. They were first investigated for use in disorders of bone metabolism in the 1960s. They are now used clinically for the treatment of osteoporosis, Paget's disease, bone metastasis, multiple myeloma, and other conditions that feature bone fragility.

Did you know?

Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.

The Scale of Life 1 The Scale of Life 1
season of life season of life
In old age, as in all other stages of the life course, people find life more pleasant if they have ... In old age, as in all other stages of the life course, people find life more pleasant if they have ...
Life Expectancy in Developing Countries Life Expectancy in Developing Countries
The life cycle of maize (Zea mays The life cycle of maize (Zea mays
The three domains of life The three domains of life
Video: Conduction of action potentials

For a complete list of videos, visit our video library