![subject](/tpl/images/cats/himiya.png)
Be sure to answer all parts. A freshly isolated sample of 90Y was found to have an activity of 2.2 × 105 disintegrations per minute at 1:00 p. m. on December 3, 2006. At 2:15 p. m. on December 17, 2006, its activity was measured again and found to be 5.8 × 103 disintegrations per minute. Calculate the half-life of 90Y. Enter your answer in scientific notation.
![ansver](/tpl/images/cats/User.png)
Answers: 2
![](/tpl/images/ask_question.png)
![](/tpl/images/ask_question_mob.png)
Another question on Chemistry
![question](/tpl/images/cats/himiya.png)
Chemistry, 22.06.2019 00:30
Used the balanced equation 2h2+ o2 - -> 2h2o. if you have 7.2 grams of o2 , how many grams of h2o can you produce ?
Answers: 2
![question](/tpl/images/cats/himiya.png)
![question](/tpl/images/cats/himiya.png)
Chemistry, 23.06.2019 03:00
What does a complete balanced chemical equation include? a. exothermic coefficients b. endothermic coefficients c. valence electrons d. molar coefficients
Answers: 1
![question](/tpl/images/cats/himiya.png)
You know the right answer?
Be sure to answer all parts. A freshly isolated sample of 90Y was found to have an activity of 2.2 ×...
Questions
![question](/tpl/images/cats/biologiya.png)
![question](/tpl/images/cats/fizika.png)
![question](/tpl/images/cats/health.png)
Health, 12.07.2019 12:00
![question](/tpl/images/cats/health.png)
Health, 12.07.2019 12:00
![question](/tpl/images/cats/fizika.png)
Physics, 12.07.2019 12:00
![question](/tpl/images/cats/es.png)
Spanish, 12.07.2019 12:00
![question](/tpl/images/cats/himiya.png)
Chemistry, 12.07.2019 12:00
![question](/tpl/images/cats/biologiya.png)
![question](/tpl/images/cats/biologiya.png)
Biology, 12.07.2019 12:00
![question](/tpl/images/cats/obshestvoznanie.png)
![question](/tpl/images/cats/obshestvoznanie.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 12.07.2019 12:00
![question](/tpl/images/cats/biologiya.png)
![question](/tpl/images/cats/ekonomika.png)
![question](/tpl/images/cats/ekonomika.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/ap.png)
Advanced Placement (AP), 12.07.2019 12:00
![question](/tpl/images/cats/health.png)
Health, 12.07.2019 12:00
![question](/tpl/images/cats/health.png)
Health, 12.07.2019 12:00
![question](/tpl/images/cats/es.png)
Spanish, 12.07.2019 12:00