Strontium-90 is a byproduct in nuclear reactors fueled by the ...

[theo]

Strontium-90 is a byproduct in nuclear reactors fueled by the radioisotope uranium-235. The half-life of strontium-90 is 28.8 yr. What percentage of a strontium-90 sample remains after 175.0 yr?
 
  A) 84.8
  B) 1.48
  C) 0.230
  D) 16.5
  E) 6.08

Question 2

What is the pressure (in mm Hg) of the gas inside the above apparatus if the outside pressure, Patm, is 736 mm Hg and the difference in mercury levels, h, is 18 mm Hg?
 
  A) 18 mm Hg
  B) 718 mm Hg
  C) 736 mm Hg
  D) 754 mm Hg

[steff9894]

Answer to Question 1

B

Answer to Question 2

B