Discuss the below:
Q: A ∏° meson with momentum 135 GeV/c decays into two photons. lt the mean life of a ∏° is 8.5 x10-17 sec, calculate to 10% accuracy how far the high-energy ∏° will travel prior to decay. What will be the approxi-mate minimum value of the opening angle of its two decay photons in the laboratory?