![subject](/tpl/images/cats/fizika.png)
Physics, 04.07.2020 14:01 Ladarius622
To measure the activity of a rock thought to be radioactive, a physicist puts the rock beside a detector and counts 225 particles in 10 minutes. To check for background, she removes the rock and then records 90 particles in 6 minutes. She converts both these answers into rates, in particles per hour, and takes their difference to give the activity of the rock alone. What is her final answer, in particles per hour, and what is its uncertainty
![ansver](/tpl/images/cats/User.png)
Answers: 2
![](/tpl/images/ask_question.png)
![](/tpl/images/ask_question_mob.png)
Another question on Physics
![question](/tpl/images/cats/fizika.png)
Physics, 21.06.2019 14:40
An implanted pacemaker supplies the heart with 72 pulses per minute, each pulse providing 6.0 v for 0.65 ms. the resistance of the heart muscle between the pacemaker’s electrodes is 550 ω. find (a) the current that flows during a pulse, (b) the energy delivered in one pulse, and (c) the average power supplied by the pacemaker.
Answers: 3
![question](/tpl/images/cats/fizika.png)
Physics, 22.06.2019 05:30
Física: un futbolista patea hacia el arco con una velocidad de 15m/ah, calcular: a)el alcance para un ángulo de tiro de 25? , b) el tiempo que el balón permanece en el aire.
Answers: 3
![question](/tpl/images/cats/fizika.png)
Physics, 22.06.2019 06:10
Which transition by an electron will release the greatest amount of energy? oa ob oc od
Answers: 2
![question](/tpl/images/cats/fizika.png)
You know the right answer?
To measure the activity of a rock thought to be radioactive, a physicist puts the rock beside a dete...
Questions
![question](/tpl/images/cats/mat.png)
Mathematics, 09.07.2019 01:30
![question](/tpl/images/cats/mat.png)
Mathematics, 09.07.2019 01:30
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/himiya.png)
Chemistry, 09.07.2019 01:30
![question](/tpl/images/cats/mat.png)
Mathematics, 09.07.2019 01:30
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/health.png)
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/geografiya.png)
Geography, 09.07.2019 01:30
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 09.07.2019 01:30
![question](/tpl/images/cats/health.png)
![question](/tpl/images/cats/himiya.png)
Chemistry, 09.07.2019 01:30
![question](/tpl/images/cats/mat.png)
Mathematics, 09.07.2019 01:30
![question](/tpl/images/cats/mat.png)
Mathematics, 09.07.2019 01:30
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/obshestvoznanie.png)
Social Studies, 09.07.2019 01:30