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.
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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
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