If a cosmic-ray proton, an alpha particle, and a 6Li nucleus all ...

[mp14]

If a cosmic-ray proton, an alpha particle, and a 6Li nucleus all have the same kinetic energy, then which one has the lowest speed?
 a. the proton
  b. the 6Li nucleus
  c. the alpha particle
  d. All cosmic rays have the same speed, c.

Question 2

A 1-gram sample of wood is taken from an ancient site. If the Carbon-14 activity of the sample is 12.5 that of present-day organic material, what is the age of the wood? (T1/2 for 14C is 5730 years.)
 a. 8600 years
  c. 11,500 years
  b. 4460 years
  d. 17,200 years

[hollysheppard095]

Answer to Question 1

B

Answer to Question 2

D