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Author Question: The half-life of cobalt-60 is 5.3 years, while that of strontium-90 is 28 years. Suppose that ... (Read 75 times)

EAugust

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on: Jul 29, 2018
The half-life of cobalt-60 is 5.3 years, while that of strontium-90 is 28 years.
 
  Suppose that samples of cobalt-60 and strontium-90 are such that they initially have the same activity (number of decays per second). What is true about the initial numbers of cobalt-60 and strontium-90 nuclei in these samples?
  A) There are equal numbers of cobalt-60 and strontium-90 nuclei.
  B) There are more cobalt-60 than strontium-90 nuclei.
  C) It is not possible to compare numbers of nuclei without knowing the masses of the samples.
  D) There are more strontium-90 than cobalt-60 nuclei.

Question 2

Two equal charges Q are separated by a distance d. One of the charges is released and moves away from the other due to the force between them. When the moving charge is a distance 3d from the other charge, what is its kinetic energy?
 
  What will be an ideal response?
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abro1885

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Reply #1 on: Jul 29, 2018
Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.
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EAugust

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Reply 2 on: Jul 29, 2018
Gracias!

amit

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Reply 3 on: Yesterday
Excellent

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