1.Using Hamilton & Petrosian (1992) expressions for mean free path (l) and angular diffusion coefficient, calculate what spectrum of whistler turbulence is needed to ensure l is equal to Larmour radius.
 

2. What spectrum of whistler turbulence is needed to ensure that the escape time (Eq. 10) does not depend on particle energy: a) in non-relativistic case, b) in relativistic case.