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Author Question: How long would it take 4.00 1020 atoms to decay to 1.00 1019 atoms if their half-life was 14.7 ... (Read 51 times)

dakota nelson

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on: Jul 29, 2018
How long would it take 4.00  1020 atoms to decay to 1.00  1019 atoms if their half-life was 14.7 years?
 
  A) 58.8 years B) 78.2 years C) 147 years D) 29.4 years

Question 2

The image of a plant is 4.0 cm from a concave spherical mirror having a radius of curvature of 10 cm. Where is the plant relative to the mirror?
 
  A) 4.4 cm in front of the mirror
  B) 9.0 cm in front of the mirror
  C) 1.0 cm in front of the mirror
  D) 2.2 cm in front of the mirror
  E) 20 cm in front of the mirror


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todom5090

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Reply #1 on: Jul 29, 2018
Answer to Question 1

B

Answer to Question 2

D


dakota nelson

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Reply #2 on: Jul 29, 2018
Thanks


todom5090

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Reply #3 on: Jul 29, 2018
Welcome :)


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