When an electron collides with a positron producing a pair of ...

[jessicacav]

When an electron collides with a positron producing a pair of high gamma rays, we call this process
 
  A) pair production
  B) matter obliteration
  C) photodisintegration
  D) annihilation

Question 2

Suppose one observes cosmic rays creating a new particle high in the atmosphere and the particle moves at 99.7 the speed of light. It is observed to decay in an average 37.0 s. What is the proper lifetime of the particle?
 
  A) 2.86 s
  B) 4.33 s
  C) 18.1 s
  D) 12.4 s
  E) 5.33 ms

[akpaschal]

Answer to Question 1

D

Answer to Question 2

A

[jessicacav]

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[akpaschal]

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