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 50 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
Gracias!

kilada

  • Member
  • Posts: 311
Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

« previous next »
 

Did you know?

Though methadone is often used to treat dependency on other opioids, the drug itself can be abused. Crushing or snorting methadone can achieve the opiate "rush" desired by addicts. Improper use such as these can lead to a dangerous dependency on methadone. This drug now accounts for nearly one-third of opioid-related deaths.

Did you know?

Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.

Did you know?

When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.

Did you know?

When Gabriel Fahrenheit invented the first mercury thermometer, he called "zero degrees" the lowest temperature he was able to attain with a mixture of ice and salt. For the upper point of his scale, he used 96°, which he measured as normal human body temperature (we know it to be 98.6° today because of more accurate thermometers).

Did you know?

In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.

These species are all at risk of extinction. Species with “slow” life-h These species are all at risk of extinction. Species with “slow” life-h
Laminaria Life Cycle Laminaria Life Cycle
The Ku Klux Klan forces John Campbell, a black man, to beg for his life in Moore County, North Carol The Ku Klux Klan forces John Campbell, a black man, to beg for his life in Moore County, North Carol
Jan de Heem, Still Life with Lobster. Jan de Heem, Still Life with Lobster.
Preschool: 3–6 years. Preschool: 3–6 years.
Life cycle of Dictyostelium discoideum, a cellular slime mold Life cycle of Dictyostelium discoideum, a cellular slime mold
Video: Parkinson's Disease

For a complete list of videos, visit our video library