Americium-243 has a decay constant of 9.39 10-5years-1. How long ...

[karateprodigy]

Americium-243 has a decay constant of 9.39  10-5years-1. How long will it take for a sample of americium to lose one-third of its nuclei?
 
  A)
 
  2960 s
  B)
 
  10.6  103 years
  C)
 
  4.32  103 years
  D)
 
  6.44  103 years
  E)
 
  7.84  103 years

Question 2

The force on a 0.500-kg particle depends on position such that F(x) = (1.00 N/m2)x2 + ( 4.00 N/m)x for a particle constrained to move along the x-axis.
 
  If the particle starts from rest at x = 0.00, what will be its speed when it reaches the position x = 4.00 m?
  A)
 
  1.65 m/s
  B)
 
  22.6 m/s
  C)
 
  14.6 m/s
  D)
 
  11.3 m/s
  E)
 
  The particle will not reach the position x = 4.00 m.

[LVPMS]

Answer to Question 1

C

Answer to Question 2

C