« previous next »

Author Question: Tritium has a half-life of 12.3 years. How many years will elapse when the radioactivity of a ... (Read 158 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 inpatient settings, adverse drug events account for an estimated one in three of all hospital adverse events. They affect approximately 2 million hospital stays every year, and prolong hospital stays by between one and five days.

Did you know?

Barbituric acid, the base material of barbiturates, was first synthesized in 1863 by Adolph von Bayer. His company later went on to synthesize aspirin for the first time, and Bayer aspirin is still a popular brand today.

Did you know?

The calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.

Did you know?

In the United States, congenital cytomegalovirus causes one child to become disabled almost every hour. CMV is the leading preventable viral cause of development disability in newborns. These disabilities include hearing or vision loss, and cerebral palsy.

Did you know?

Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.

Fern life cycle Fern life cycle
Cumulative change for six personality-trait domains across the life course show distinct patterns. Cumulative change for six personality-trait domains across the life course show distinct patterns.
The age-related increase in spirituality is different for two cohorts born seven years apart. The ... The age-related increase in spirituality is different for two cohorts born seven years apart. The ...
Integrals for Life Integrals for Life
Historical Life Expectancy Historical Life Expectancy
Nick buys a $25 000, 5.4% bond with quarterly interest coupons, 3 years before maturity, to ... Nick buys a $25 000, 5.4% bond with quarterly interest coupons, 3 years before maturity, to ...
Video: Acid-base imbalances - respiratory acidosis and alkalosis

For a complete list of videos, visit our video library