The mean life (time constant) of rubidium-86 is 26.8 d. What is ...

[Frost2351]

The mean life (time constant) of rubidium-86 is 26.8 d. What is its half-life?
 
  What will be an ideal response?

Question 2

A tiny dust particle of mass 8.50 g is being observed under a microscope. Its position is determined to be within a space of 0.0060 mm. (h = 6.626  10-34 J  s)
 
  (a) Find the uncertainty in its speed implied by the uncertainty in its position.
  (b) Assuming the dust particle is moving at the speed in part (a), how many years would it take for the particle to move 1.0 mm?

[tuwy]

Answer to Question 1

18.6 d

Answer to Question 2

(a) 2.1  10-21 m/s (b) 1.5  1010 y