The threshold energy to initiate a certain nuclear reaction is ...

[Melani1276]

The threshold energy to initiate a certain nuclear reaction is 3.16 MeV and the Q for the reaction is -2.37 MeV. The stationary target is how many times as massive as the incident particle?
 
  What will be an ideal response?

Question 2

A long line of charge with charge per unit length 1 is located on the x-axis and another long line of charge with charge per unit length 2 is located on the y-axis with their centers crossing at the origin.
 
  In what direction is the electric field at point z = a on the positive z-axis if 1 and 2 are positive? A)
 
  the positive z-direction
  B)
 
  halfway between the x-direction and the y-direction
  C)
 
  the negative z-direction
  D)
 
  all directions are possible parallel to the x-y plane
  E)
 
  cannot be determined

[Jmfn03]

Answer to Question 1

3.0 times as massive

Answer to Question 2

A

[Melani1276]

TYSM

[Joy Chen]

Excellent