How long would it take 4.00 1020 atoms to decay to 1.00 1019 ...

[dakota nelson]

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

[todom5090]

Answer to Question 1

B

Answer to Question 2

D

[dakota nelson]

Thanks

[todom5090]

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