Homework Statement
Show that the energy momentum conservation forbids the reaction (gamma)-> positron + electron,
Gamma is a photon, which is chargeless and massless
Homework Equations
E(photon)=hf
p(photon)=hf/c
Conservation of Energy
Conservation of Momentum
4-momentum
The Attempt at a...
Homework Statement
An overdamped oscillator with natural frequency w and damping coefficient y starts out at a position xo>0.
What is the maximum initial speed (directed toward the origin) it can have and not cross the origin?
Homework Equations
Overdamped Case Equation...