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Author Question: The decay constant of neptunium-239 is 0.2975 d-1. What are its (a) half-life and (b) mean life? ... (Read 136 times)

sarasara

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on: Jul 29, 2018
The decay constant of neptunium-239 is 0.2975 d-1. What are its (a) half-life and (b) mean life?
 
  What will be an ideal response?

Question 2

The distance between two asteroids is 1600 km. How much time does it take for a light signal to go from one asteroid to the other? (c = 3.0  108 m/s)
 
  A) 19 ms
  B) 4.5 ms
  C) 5.3 ms
  D) 13 ms
  E) 19 s
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carojassy25

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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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sarasara

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Reply 2 on: Jul 29, 2018
Thanks for the timely response, appreciate it

juliaf

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Reply 3 on: Yesterday
Excellent

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