Optics SUB-MENU Optics Sub-menu Problem NoChaptersChapters


596.


Problem 43.23 (RHK)


Muons (mass) and neutral pions , each with momentum , pass through a transparent material. We have to find the range of index of refraction so that only the muons emit Cerenkov radiation.


Solution:           Click For PDF Version

Relativistic equation for the momentum of a particle of rest mass m moving with velocity v is

Algebraically rearranging the above expression, we find that

We will use the above result for calculating the ratios for neutral pions and muons having momentum .

We find that

and

A particle emits Cerenkov radiation in a medium only if its speed exceeds the speed of light in that medium. Therefore, the range of index of refraction of the material

,

will be fixed by requiring that the speed of the muons is greater than the speed of light in the medium, , and that the speed of light in the medium exceeds the speed of neutral pions in the medium. The range of refractive index of the material should therefore be