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

Author Question: One mole of Strontium-90 is decaying with a half life of 28. years. After 61. years, how much ... (Read 123 times)

washai

  • Hero Member
  • *****
  • Posts: 523
on: Jul 29, 2018
One mole of Strontium-90 is decaying with a half life of 28. years. After 61. years, how much Strontium is left and what is its activity?
 
  What will be an ideal response?

Question 2

A very fine sample is placed 0.15 cm from the objective of a microscope. The focal length of the objective is 0.14 cm and of the eyepiece is 1.0 cm. The near-point distance of the person using the microscope is 25.0 cm.
 
  What is the final magnification of the microscope? A) -375
  B) -242
  C) -108
  D) -142
  E) -100


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

Koolkid240

  • Sr. Member
  • ****
  • Posts: 357
Reply #1 on: Jul 29, 2018
Answer to Question 1

0.22 mole; 5.5  10-3 mole/yr = 1.0  1014 Becquerel = 2.8  103 Curie

Answer to Question 2

A


washai

  • Member
  • Posts: 523
Reply 2 on: Jul 29, 2018
Excellent

laurnthompson

  • Member
  • Posts: 334
Reply 3 on: Yesterday
Great answer, keep it coming :)

« previous next »
 

Did you know?

Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).

Did you know?

According to the Migraine Research Foundation, migraines are the third most prevalent illness in the world. Women are most affected (18%), followed by children of both sexes (10%), and men (6%).

Did you know?

The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.

Did you know?

Drug abusers experience the following scenario: The pleasure given by their drug (or drugs) of choice is so strong that it is difficult to eradicate even after years of staying away from the substances involved. Certain triggers may cause a drug abuser to relapse. Research shows that long-term drug abuse results in significant changes in brain function that persist long after an individual stops using drugs. It is most important to realize that the same is true of not just illegal substances but alcohol and tobacco as well.

Did you know?

HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.

The complete life cycle of a trematode. The complete life cycle of a trematode.
Pregnancy Life Pregnancy Life
Historical Life Expectancy Historical Life Expectancy
What amount was invested 35 years ago at 7% compounded semiannually if the value of the ... What amount was invested 35 years ago at 7% compounded semiannually if the value of the ...
Life cycle of a fern Life cycle of a fern
Earth 240 Million Years Ago Earth 240 Million Years Ago
Video: Immune responses Animation

For a complete list of videos, visit our video library